That blog you provided a link to is not wearing the Fadtastic theme. It is wearing the Day Dream theme.
Are you experienced at CSS editing and have you purchased the annually renewable CSS upgrade? You can try before you buy here . Appearance > Edit CSS http://en.support.wordpress.com/custom-css/ Also note that all wordpress blogs have built-in RSS feeds for posts(entries) and for comments. Hiding the icon does not eliminate the RSS feed.