Verifying your vBSEO Google/Yahoo Sitemap Generator is Installed Correctly
The vBSEO Google/Yahoo Sitemap Generator is a tool designed to create sitemaps, to then be submitted to Google and Yahoo, to tell the Search Engines what is available to index on your site.
Of File Locations and .htaccess Redirections
After installing the Sitemap, the actual sitemap files will be located at /<forumroot>/vbseo_sitemap/data/.
When you submit the sitemap to Google/Yahoo, the path you use is http://www.<domain>.com/sitemap_title.xml.gz (if you have pages in the root, or other directories than /forum/, or if your forum is in the root), or http://www.<domain>.com/forum/sitemap_title.xml.gz (if you only want to index pages from /forums/).
When the Search Engine goes to that location, the .htaccess file redirects it to the actual location under /vbseo_sitemap/data.
Submitting to Google:
https://www.google.com/webmasters/tools/ is the place that you use to manage your Sitemaps, across as many sites as you want.
Create a Google account and login at https://www.google.com/webmasters/tools/ , then add your Site by entering the domain name into the box, and clicking Add Site.
Next, click the Sitemaps link in the left navigation column, then 'Add a Sitemap'. Choose 'Add General Web Sitemap', then enter either sitemap_index.xml.gz or /forumroot/sitemap_index.xml.gz in the box provided. Repeat for each additional sitemap that you have generated.
You will also need to Verify that you are the owner of the site. This is done by either uploading an html file to your site, or entering a meta tag into a template on your default (Guests) style. It is up to you which you use.
Is My Sitemap Working, and is it Where I Told Google?
To determine whether the Sitemap has been generated, and whether the .htaccess is working, simply call the Sitemap's URL in your browser, eg: http://www.<domain>.com/sitemap_index.xml.gz. If it downloads, it's working.
Assuming the test you ran above worked (you could download the sitemap using the URL you gave Google), your Sitemaps will be accessed by Google within a few days.