Help!! Please Help!!!

Okay, I've already stated that I'm new at all this, so I was looking around at backgrounds to help jazz up my page a little bit and I found this really cute one with fall leaves that I love, but I have no earthly idea how to put up it on here. The instructions said to
1. Sign in to Blogger. This will take you to your Dashboard.
2. Under the blog you wish to change the background for, click on Layout.
3. You are now in the Add and Arrange Page Elements screen. Click Add a Page Element.
4. You are now in the Choose a new Page Element Screen. You'll see where it says HTML/JavaScript. Underneath there, click Add to Blog.
5. You are now in the Configure HTML/JavaScript Screen. Under Content you'll see a large box, paste the entire following HTML code in that space.

Step number 3 is the one that lost me because once I got to my "arrange page elements screen" there was no tab that said "add a page element" at least not one I could find anywhere. Can someone please help me? I know this is probably annoying, but once I'm told how to do something once, I'm pretty good at understand it from there on out.