Open an text editor, and put code:
<IfModule mod_rewrite.c>
Options -MultiViews
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule \.(js|css|jpeg|jpg|gif|png|ico|map)(\?|$) /404error.php [L,NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
Save with this name: .htaccess
Put the ".htaccess" file on your forum directory.
Now, go to this url:
YourWebsiteUrl.com/AdminPanel/?app=core&module=promotion&controller=seo&tab=urls