choukoulou, your english is not that bad, i mean it's sufficient to be understand !
asher, first you must be logged in, then go to the png factory, click on "upload a png" under the ad,
click "parcourir" , tape a name in "nom de l'icone" , select a "categorie", and finally click on "envoyer" !!! ^^
and about the fact you're not french i don't think it'll be a problem, many of the members speaks english, and will be fine to help you! (don't want to overpast the admin's authority ^^)
the only problem is for you to understand the other topics i think.
btw you can introduce yourself
here if you want, welcome ^^