I do apologise for taking so long to get back to you. Computer troubles ¬_¬
Anyway, when it comes to submitting art, you should be able to hit a button marked "contribute/submit art". When that opens, their should be about six buttons along the top with "submitting to" over on the far right with a drop down menu. If there isn't, I might need to go in and fix the submitting feature myself
Hope this helps