RSS feed for per post change

Hi, need to know how to change rss feed for different pages on website, problem which i am facing is on my blog all post have detailed feed data but when i see my pages on main website like http://www.scientificanimations.com/3d-medical-animation/ than feed of this page only shows
Title – Comments on: 3D Medical Animation
and Description – 3D medical animations. I’ve to change rss feed for each page. Plz guide me.
I referred to this doc also http://codex.wordpress.org/Customizing_Feeds but not understood anything.