Seriously.

I have been trying to figure out how to put on a pet overlay. >.<

Can anyone tell me how to do it? I am stumped.

in your pets description box put this code without the spaces and that should work for you. <style> {background-image: url(URL OF UPLOADED OVERLAY HERE); width: IMAGEWIDTHpx; height: IMAGEHEIGHTpx;}</style>

there is an FAQ thread in the profiles and graphics discussion section of the forums.