Late answer, but you need to go on Pmc, then there would be an option on what view to make your skins, it is on the top right corner of your screen and you will be given one option where you can change it to the file form, there are spaces that can be put in with pixels you won't see on the actual skin.

i have a question, how do you add your signature on your skin?? the one that i cant seem to make??