domain link

[Hectorsky]

I want to to change forum.domain.com to domain.com , i changed that setting on URL settings from admincp

domain.com
domain.com
domain.com/core

But still doesn't work , maybe I need something to fix on my httacces

here is my httcces :

PHP Code:

RewriteEngine On
    
    #In some cases where you have other mod_rewrite rules, you may need to comment out the following line
    #and change it to match your folder name. This resets the other mod_rewrite rules for just this directory
    #If your site was www.example.com/forum, the setting would be /forum/
    #RewriteBase / 

    # Send css calls directly to the correct file VBV-7807
    RewriteRule ^css.php$ core/css.php [NC,L]

    # Redirect old install path to core.
    RewriteRule ^install/ core/install/ [NC,L]

    # Main Redirect
    RewriteCond %{REQUEST_URI} !\.(gif|jpg|jpeg|png|css)$
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php?routestring=$1 [L,QSA]

    # Because admincp is an actual directory.
    RewriteRule ^(admincp/)$ index.php?routestring=$1 [L,QSA]

</IfModule>