[LinkBliss_com]

It depends if you already have an .htaccess file in your forum root... look at the readme in the docs folder, there are installation and upgrade instructions. I think the part you want is this:

B. Enable rewriting via .htaccess (vBSEO Users skip this step):
Upload the vBSEO Google/Yahoo Sitemap .htaccess file (located in the 'htaccess' folder) to your forum root.

Note: In some operating systems, the .htaccess file is not visible. If this is your case, find the htaccess.txt file in the same folder, (1) upload it to your forum root folder and (2) rename it to .htaccess.

Note: If you already have an .htaccess file in your forum root, DO NOT upload the vBSEO Google/Yahoo Sitemap .htaccess file as it will replace the contents of this file. Instead, enter the following code in your 'forum-root/.htaccess' file at the bottom:

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

hope this helps!
Eric