How do you become a red werewolf in morrowind

I'm afraid you can't in the normal game. There are no red werewolves in an unaltered version of Morrowind. However, you can become one if you download a modified version of the game from the Morrowind website, or you can create your own using the Elder Scrolls Construction Set and one of the many softwares that allow you to modify the NIF files of the game.