Here are a couple of ways to edit your myspace layout. I will use my account to show this. By the way...since I am showing you my myspace...and it is "private"...you should deffinately add me.
Step 1: Find a layout
Go to Google and find a layout that you like. Be sure that you don't enter your password ANYWHERE other than Myspace..there are a lot of scams out there.
When you find one that looks good...go to the next step!