I submitted an avatar for my comic, and then realized it was in the wrong format when I saw the "updated" guideline ("no text in image", though the previous guideline said to include text).  I submitted a revised avatar, but found that I couldn't delete the first one!  How do I remove the first one from the submission?  I'd rather not have two avatars with the same name on the list!  Any thoughts?  (or a really basic guide to how to use this site?)