Enable FeedBurner for your RSS feed
FeedBurner is a tool that provides traffic analysis and subscription statistics for your blog's RSS feed. If you would like to enable FeedBurner, enter your feed name in the Blog settings panel. Your feed name is the last part of your FeedBurner address, e.g.
http://feeds.feedburner.com/MY-FEED-NAME
You can find your FeedBurner address by logging in to your FeedBurner account and clicking on the Edit Feed Details link.