Wallpapers go to art ^ but good luck on it! :>
To upload a replay you need to have your replays folder [if you don't have it, go to your games folder under your C drive, toribash should be there, drag and drop it to your desktop] next go on forums, go to the replay thread, hit "Go Advanced" below the quick reply. Scroll down and look for attachments, when you find it click the button there then a pop up should come up, in the pop up, click browse, go to where ever you put your toribash folder, go to replays, find your replay, click it and hit "open" now all you gotta do is hit upload near the bottom of the pop up.
And I know that was off topic but I was helpin :3