I KNOW ITS STUPID BUT I'VE TRIED A MILLION TIMES AND IT JUST WONT UPLOAD. HELP PLZ.

What is 'it' and what are you trying to upload? Go easy on the caps too, its not come blasted crisis, goodness gracious you're not going to die if its not uploaded. :/

Usually, image file types don't have any problem uploading. Perhaps you need to resize your image and make it a little smaller. I read your bio on your userpage here and it says you're a writer. Artgrounds does not host literature at the moment; if it's a text document, it will not upload.

Get your finger off the shift key.

I think he's referring to his avatar, if I'm not mistaken...