The auto-discovery tags are not in your RSS feeds, but are located in the HTML templates and pages of your blog itself. In your main index and archive templates look for code that looks like this:
<link rel="alternate" type="application/atom+xml" title="Atom" href="<$MTBlogURL$>atom.xml" />
<link rel="alternate" type="application/rss+xml" title="RSS 1.0" href="<$MTBlogURL$>index.rdf" />
<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="<$MTBlogURL$>index.xml" />
And replace it with:
<link rel="alternate" type="application/rss+xml" title="RSS" href=" http://feeds.feedburner.com/Life2point0" />
I hope that helps!