how do i make psp skins stick to the psp?

Return it, maybe it is defective... =[ Or try some sort of adhesive

Skins only upload hues and style on your PSP. that's a significant sticky label on your PSP. as a replace of the modern black, pink, white, blue, etc. which you generally see, you could beautify it with varieties, characters, etc. once you're lacking the battery disguise, you could in all probability get it from Sony.

i tried elmer's glue but found duct tape to hold better.

carefull though, it does tend to leave a sticky residue after removal.