Ve a
ACP



luego te vas a donde dice .htacces, te vas hasta abajo deonde dice más opciones y le das en si
te vas a donde dice ubicación de htacces y le das en si y luego enviar
copias el código que te envía por ejemplo a mi me da este:
Spoiler
# Lines That should already be in your .htacess
<Files "config.php">
Order Allow,Deny
Deny from All
</Files>
<Files "common.php">
Order Allow,Deny
Deny from All
</Files>
# You may need to un-comment the following lines
# Options +FollowSymlinks
# To make sure that rewritten dir or file (/|.html) will not load dir.php in case it exist
# Options -MultiViews
# REMEBER YOU ONLY NEED TO STARD MOD REWRITE ONCE
RewriteEngine On
# Uncomment the statement below if you want to make use of
# HTTP authentication and it does not already work.
# This could be required if you are for example using PHP via Apache CGI.
# RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
# REWRITE BASE
RewriteBase /
# HERE IS A GOOD PLACE TO FORCE CANONICAL DOMAIN
# RewriteCond %{HTTP_HOST} !^manganimemas\.com$ [NC]
# RewriteRule ^(.*)$ http://manganimemas.com/$1 [QSA,L,R=301]
# DO NOT GO FURTHER IF THE REQUESTED FILE / DIR DOES EXISTS
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
#####################################################
# PHPBB SEO REWRITE RULES ALL MODES
#####################################################
# AUTHOR : dcz www.phpbb-seo.com
# STARTED : 01/2006
#################################
# FORUMS PAGES
###############
# FORUM INDEX REWRITERULE WOULD STAND HERE IF USED. "forum" REQUIRES TO BE SET AS FORUM INDEX
# RewriteRule ^foro/forum\.html$ /foro/index.php [QSA,L,NC]
# FORUM ALL MODES
RewriteRule ^foro/(forum|[a-z0-9_-]*-f)([0-9]+)(-([0-9]+))?\.html$ /foro/viewforum.php?f=$2&start=$4 [QSA,L,NC]
# TOPIC WITH VIRTUAL FOLDER ALL MODES
RewriteRule ^foro/(forum|[a-z0-9_-]*-f)([0-9]+)/(topic|[a-z0-9_-]*-t)([0-9]+)(-([0-9]+))?\.html$ /foro/viewtopic.php?f=$2&t=$4&start=$6 [QSA,L,NC]
# GLOBAL ANNOUNCES WITH VIRTUAL FOLDER ALL MODES
RewriteRule ^foro/announces/(topic|[a-z0-9_-]*-t)([0-9]+)(-([0-9]+))?\.html$ /foro/viewtopic.php?t=$2&start=$4 [QSA,L,NC]
# TOPIC WITHOUT FORUM ID & DELIM ALL MODES
RewriteRule ^foro/([a-z0-9_-]*)/?(topic|[a-z0-9_-]*-t)([0-9]+)(-([0-9]+))?\.html$ /foro/viewtopic.php?forum_uri=$1&t=$3&start=$5 [QSA,L,NC]
# PHPBB FILES ALL MODES
RewriteRule ^foro/resources/[a-z0-9_-]+/(thumb/)?([0-9]+)$ /foro/download/file.php?id=$2&t=$1 [QSA,L,NC]
# PROFILES ALL MODES WITH ID
RewriteRule ^foro/(member|[a-z0-9_-]*-u)([0-9]+)\.html$ /foro/memberlist.php?mode=viewprofile&u=$2 [QSA,L,NC]
# USER MESSAGES ALL MODES WITH ID
RewriteRule ^foro/(member|[a-z0-9_-]*-u)([0-9]+)-(topics|posts)(-([0-9]+))?\.html$ /foro/search.php?author_id=$2&sr=$3&start=$5 [QSA,L,NC]
# GROUPS ALL MODES
RewriteRule ^foro/(group|[a-z0-9_-]*-g)([0-9]+)(-([0-9]+))?\.html$ /foro/memberlist.php?mode=group&g=$2&start=$4 [QSA,L,NC]
# POST
RewriteRule ^foro/post([0-9]+)\.html$ /foro/viewtopic.php?p=$1 [QSA,L,NC]
# ACTIVE TOPICS
RewriteRule ^foro/active-topics(-([0-9]+))?\.html$ /foro/search.php?search_id=active_topics&start=$2&sr=topics [QSA,L,NC]
# UNANSWERED TOPICS
RewriteRule ^foro/unanswered(-([0-9]+))?\.html$ /foro/search.php?search_id=unanswered&start=$2&sr=topics [QSA,L,NC]
# NEW POSTS
RewriteRule ^foro/newposts(-([0-9]+))?\.html$ /foro/search.php?search_id=newposts&start=$2&sr=topics [QSA,L,NC]
# UNREAD POSTS
RewriteRule ^foro/unreadposts(-([0-9]+))?\.html$ /foro/search.php?search_id=unreadposts&start=$2 [QSA,L,NC]
# THE TEAM
RewriteRule ^foro/the-team\.html$ /foro/memberlist.php?mode=leaders [QSA,L,NC]
# HERE IS A GOOD PLACE TO ADD OTHER PHPBB RELATED REWRITERULES
# FORUM WITHOUT ID & DELIM ALL MODES (SAME DELIM)
# THESE FOUR LINES MUST BE LOCATED AT THE END OF YOUR HTACCESS TO WORK PROPERLY
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^foro/([a-z0-9_-]+)(-([0-9]+))\.html$ /foro/viewforum.php?forum_uri=$1&start=$3 [QSA,L,NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^foro/([a-z0-9_-]+)\.html$ /foro/viewforum.php?forum_uri=$1 [QSA,L,NC]
# FIX RELATIVE PATHS : FILES
RewriteRule ^foro/.+/(style\.php|ucp\.php|mcp\.php|faq\.php|download/file.php)$ /foro/$1 [QSA,L,NC,R=301]
# FIX RELATIVE PATHS : IMAGES
RewriteRule ^foro/.+/(styles/.*|images/.*)/$ /foro/$1 [QSA,L,NC,R=301]
# END PHPBB PAGES
#####################################################
<Files "config.php">
Order Allow,Deny
Deny from All
</Files>
<Files "common.php">
Order Allow,Deny
Deny from All
</Files>
# You may need to un-comment the following lines
# Options +FollowSymlinks
# To make sure that rewritten dir or file (/|.html) will not load dir.php in case it exist
# Options -MultiViews
# REMEBER YOU ONLY NEED TO STARD MOD REWRITE ONCE
RewriteEngine On
# Uncomment the statement below if you want to make use of
# HTTP authentication and it does not already work.
# This could be required if you are for example using PHP via Apache CGI.
# RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
# REWRITE BASE
RewriteBase /
# HERE IS A GOOD PLACE TO FORCE CANONICAL DOMAIN
# RewriteCond %{HTTP_HOST} !^manganimemas\.com$ [NC]
# RewriteRule ^(.*)$ http://manganimemas.com/$1 [QSA,L,R=301]
# DO NOT GO FURTHER IF THE REQUESTED FILE / DIR DOES EXISTS
RewriteCond %{REQUEST_FILENAME} -f
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
#####################################################
# PHPBB SEO REWRITE RULES ALL MODES
#####################################################
# AUTHOR : dcz www.phpbb-seo.com
# STARTED : 01/2006
#################################
# FORUMS PAGES
###############
# FORUM INDEX REWRITERULE WOULD STAND HERE IF USED. "forum" REQUIRES TO BE SET AS FORUM INDEX
# RewriteRule ^foro/forum\.html$ /foro/index.php [QSA,L,NC]
# FORUM ALL MODES
RewriteRule ^foro/(forum|[a-z0-9_-]*-f)([0-9]+)(-([0-9]+))?\.html$ /foro/viewforum.php?f=$2&start=$4 [QSA,L,NC]
# TOPIC WITH VIRTUAL FOLDER ALL MODES
RewriteRule ^foro/(forum|[a-z0-9_-]*-f)([0-9]+)/(topic|[a-z0-9_-]*-t)([0-9]+)(-([0-9]+))?\.html$ /foro/viewtopic.php?f=$2&t=$4&start=$6 [QSA,L,NC]
# GLOBAL ANNOUNCES WITH VIRTUAL FOLDER ALL MODES
RewriteRule ^foro/announces/(topic|[a-z0-9_-]*-t)([0-9]+)(-([0-9]+))?\.html$ /foro/viewtopic.php?t=$2&start=$4 [QSA,L,NC]
# TOPIC WITHOUT FORUM ID & DELIM ALL MODES
RewriteRule ^foro/([a-z0-9_-]*)/?(topic|[a-z0-9_-]*-t)([0-9]+)(-([0-9]+))?\.html$ /foro/viewtopic.php?forum_uri=$1&t=$3&start=$5 [QSA,L,NC]
# PHPBB FILES ALL MODES
RewriteRule ^foro/resources/[a-z0-9_-]+/(thumb/)?([0-9]+)$ /foro/download/file.php?id=$2&t=$1 [QSA,L,NC]
# PROFILES ALL MODES WITH ID
RewriteRule ^foro/(member|[a-z0-9_-]*-u)([0-9]+)\.html$ /foro/memberlist.php?mode=viewprofile&u=$2 [QSA,L,NC]
# USER MESSAGES ALL MODES WITH ID
RewriteRule ^foro/(member|[a-z0-9_-]*-u)([0-9]+)-(topics|posts)(-([0-9]+))?\.html$ /foro/search.php?author_id=$2&sr=$3&start=$5 [QSA,L,NC]
# GROUPS ALL MODES
RewriteRule ^foro/(group|[a-z0-9_-]*-g)([0-9]+)(-([0-9]+))?\.html$ /foro/memberlist.php?mode=group&g=$2&start=$4 [QSA,L,NC]
# POST
RewriteRule ^foro/post([0-9]+)\.html$ /foro/viewtopic.php?p=$1 [QSA,L,NC]
# ACTIVE TOPICS
RewriteRule ^foro/active-topics(-([0-9]+))?\.html$ /foro/search.php?search_id=active_topics&start=$2&sr=topics [QSA,L,NC]
# UNANSWERED TOPICS
RewriteRule ^foro/unanswered(-([0-9]+))?\.html$ /foro/search.php?search_id=unanswered&start=$2&sr=topics [QSA,L,NC]
# NEW POSTS
RewriteRule ^foro/newposts(-([0-9]+))?\.html$ /foro/search.php?search_id=newposts&start=$2&sr=topics [QSA,L,NC]
# UNREAD POSTS
RewriteRule ^foro/unreadposts(-([0-9]+))?\.html$ /foro/search.php?search_id=unreadposts&start=$2 [QSA,L,NC]
# THE TEAM
RewriteRule ^foro/the-team\.html$ /foro/memberlist.php?mode=leaders [QSA,L,NC]
# HERE IS A GOOD PLACE TO ADD OTHER PHPBB RELATED REWRITERULES
# FORUM WITHOUT ID & DELIM ALL MODES (SAME DELIM)
# THESE FOUR LINES MUST BE LOCATED AT THE END OF YOUR HTACCESS TO WORK PROPERLY
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^foro/([a-z0-9_-]+)(-([0-9]+))\.html$ /foro/viewforum.php?forum_uri=$1&start=$3 [QSA,L,NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^foro/([a-z0-9_-]+)\.html$ /foro/viewforum.php?forum_uri=$1 [QSA,L,NC]
# FIX RELATIVE PATHS : FILES
RewriteRule ^foro/.+/(style\.php|ucp\.php|mcp\.php|faq\.php|download/file.php)$ /foro/$1 [QSA,L,NC,R=301]
# FIX RELATIVE PATHS : IMAGES
RewriteRule ^foro/.+/(styles/.*|images/.*)/$ /foro/$1 [QSA,L,NC,R=301]
# END PHPBB PAGES
#####################################################
y pegas el código lo guardas como .htacces, si por cualquier razón no te permite guardarlo, puedes usar el .htacces que viene en el paquete 3.0.7 pl1, no el de tu foro si no uno recien desempaquetado.
una vez guardado te vas a tu ftp a la carpeta forum y lo pegas.
listo, verás que funciona.