Just click "Attatch Files" At the bottom of the post when you are making it, and attatch the toribahs replays. You will find them in:
Computer-C:-Games-Toribash-Replay-<replay here>
...
What if they don't accept you?
And why are you leaving? If you leave, you can't come back untill you are a 2nd dan so I would not leave if I were you..