This is a plugin originally authored by Steve Smith. It detects all ways to access your original WordPress feeds and redirects them to your FeedBurner
1.Download the plugin and expand it to the plugin folder(wp-content/plugins/).
2.Login into the WordPress administration area and go to the plugin page.
3.Click the activate link of the 'Feedburner feedsmith extend' plugin.
4.You can then go to Settings -> FeedBurner FeedSmith Extend to configure all your FeedBurner feeds.