[Plugin: Google XML Sitemaps] XML Sitemap Generator for WordPress

I created a sitemap for my website http://halloweendecoratingideas.net/sitemap.xml.

I noticed other wordpress sites that have their sitemap as a “page.” I have been trying to figure out how it is done.

Can someone give any advice as how I can correct this?

Thank you so much.

http://wordpress.org/extend/plugins/google-sitemap-generator/