Now Blogger has introduced "Follow by Email" Feedburner email subscription widget for blogger blogs. So you don't want to add your site to the Feedburner manually. It will save your time.
To add this widget to your blog,
1.Log in to your dashboard --> Design -->Page Elements.
2.Click on 'Add a Gadget' on the sidebar.
3.Select "Follow by Email".
4.Now if you want you can add "FeedBurner URL" manually. but your feed address is automatically added to the "Feedburner URL" box by Blogger.
5. Click save. You are done.