RSS confusion

1- do you have to have a feedburner.google account or can you use it as is with the ATA theme?

2- How do I add the 'as is' RSS feed to the right side bar...do I use BFA Subscribe under Widgets?

3- All I want is for my visitors to click on an RSS icon to subscribe to new / edited posts. I do not want the email or comment feeds.

Hope this makes sense. I did read through many of the posts already on the forum and never found exactly what I am looking for...a simple explanation..