Well first depends what kind of red hair? If I'm guessing you want what everyone is wanting right now the Rihanna hair.. What I did was use Loreal HIghcolor Magenta I got it at Sallys. Since I have...
Well its a good thing you already have bright hair because you don't have to go to the trouble of bleaching it. You can just get any red dye and put it on and you wont have to go to the trouble of...
It will probably take some time. Go to a store and buy some vinegar and rinse your hair with it for a week or two. Then you should have most of the dye out and you can color it again.