To get to the MySpace profile editor you'll have to first log into MySpace. At the top of your MySpace page click on "Profile" then "Customize Profile". You're now in the MySpace profile editor.
The first thing you're going to want to do it choose a new MySpace theme. There are many MySpace themes to choose from. Just click on one of the MySpace themes available to see how it will look on your MySpace profile. When you find the one you like, leave it on the page and move on to the next part of setting up your MySpace profile.