404 on Sitemap Index URL

Installed Sitemap Generator 2.2.

went to visit Your Google Sitemap Index URL: http://fmldesign.chaos-forums.net/fo...p_index.xml.gz

and i'm returned with 404 error

MAke sure your htaccess file reflects your subdomain

Code:

RedirectMatch "^/?$" "http://fmldesign.chaos-forums.net/forums/index.php"

RewriteEngine On
RewriteRule ^((urllist|sitemap).*\.(xml|txt)(\.gz)?)$ vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L]

that is my current .htaccess what should I add to reflect my subdomain?
as you can tell i'm not that good with .htaccess

Please check if mod_rewrite is supported: [How to] Check if mod_rewrite is working for my site

it's supported for sure

Is that .htaccess in forums/ folder?

ah is that the problem? as I have it in the root not the forums/ folder

It should be in forums/.