go on to 'see inside' (the big blue square above this box) and press on 'backdrops' there you will see a big capital ' T ' click on that and type in your name.
I added a BUNCH of animals. Choose which one is your favorite and put your username there. Keep remixing! :) Btw, This was accidental, but if you flip through all the pictures really fast, they form a heart! If you can't see it, either look a little longer, or click B. B will show you an outline of where you should look. B again makes the outline disappear.