The folders are set in ip.seo sitemap settings:

Sitemap Options
Sitemap path
Path to where you want your sitemap. If you're using IP.Content, this may not be your forum root.

Note: If your path does not start with a /, it will be treated as relative to your forum root. Leave blank for the forum root. Revert

Sitemap URL
URL to your sitemap location, not including the filename. Leave blank to use board root URL.

e.g. http://www.mysite.com/ Revert
Ping search engines? Yes
No
Do you want to inform search engines (Google, Bing, Yahoo, Ask and Moreover) when your sitemap is updated?