People are allowed to edit their picks as long as its done before game time. If games have already gone off then the person wishing to edit other games will need to leave the original post as proof of their picks for the games that are done and throw up a new post to indicate the change they wish. This makes scoring more of a bitch though.
People may wish to do this if relevant things happen after thursday.. like a star gets hucked out of the game for whatever.
