# Comment the following line (add '#' at the beginning) 
# to disable mod_rewrite functions. 
# Please note: you still need to disable the hack in 
# the vBSEO control panel to stop url rewrites. 
RewriteEngine On 
# Some servers require the Rewritebase directive to be 
# enabled (remove '#' at the beginning to activate) 
# Please note: when enabled, you must include the path 
# to your root vB folder (i.e. RewriteBase /forums/) 
#RewriteBase / 
#RewriteCond %{HTTP_HOST} !^www\.siteadi\.net 
#RewriteRule (.*) http://www.siteadi.net/$1 [L,R=301] 
RewriteRule ^((urllist|sitemap_).*.(xml|txt)(.gz)?)$ vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L] 
RewriteCond %{REQUEST_URI} !(admincp/|modcp/|cron) 
RewriteRule ^((archive/)?(.*.php(/.*)?)?)$ vbseo.php [L,QSA] 
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteCond %{REQUEST_FILENAME} !-d 
RewriteCond %{REQUEST_FILENAME} !^(admincp|modcp|clientscript|cpstyles|images)/ 
RewriteRule ^(.+)$ vbseo.php [L,QSA]

Not defterinde .htaccess isimli dosya oluştur bu kodları oraya yapıştır forumun kurulu olduğu dizine atıp öyle deneyin.
Dosyadaki gerekli yerlere site adresinizi yazın.