Find the Subscribe buttons that should be living over in your sidebar: one is entitled Posts, the other is Comments and each of these is prefaced by an orange button.
The first thing you’ll want to do is shrink down your current window with the form asking you for your feed URL, so you don’t lose your work thus far, and then navigate over to Blogger. (For the sake of this tutorial we’ll be using Blogger). If you have a WordPress blog, no worries. See the video at the bottom of this page.