To use a template, you'll need to reference is with:
{{Template:Rss}}
List of Available Templates
Some of these you may want to use directly, and some of them you'll want
to take a look at via "edit feature". It'll give you an idea of how you can
access the extension directly without referencing it as a template.
Rss Feed for SmallBusiness.com
Flickr Feed from Rexblog.com
YouTube
Google Maps
