Anyway first you have to upload it normally, then on the page of the art you just uploaded, you'll see "Add to Groups" on the right side. Just add the art you want to put in the group from there. :3
ohhh ok omg today i went to circle k to get stuff and i was guna go round the blocks to look for this persons dog and these people said thas girl yesterday almost got kiddnaped and it was just down the street soo scary