Go here:http://forum.toribash.com/forumdisplay.php?f=10
Read rules/sticked threads.
Before posting click on "Go Advanced" find and click on this icon:
Go on your local disk and find: Games>Toribash>Replay. Choose your replay file and upload it. After upload be finished close the window was open. Submit the post and the file will appear at the bottom of your post.