Feedburner is a lot of things, but mainly I have used it as a way to promote RSS Feeds that I have on various sites. It also gives a feedback as to how many people are currently watching that feed.
You cannot (as far as I know) merge your blog into FeedBurner… The only thing you can really do is add your RSS Feed to Feedburner so that people can subscribe to it.
However, a lot of BH webmasters like to use RSS feeds – so you will have to watch for duplicate content when you use this method of promotion.