1) Go to yahoo.com
2) Press sign up (on the right side, next to "free mail")
3) Fill in info (it doesn't have to be real info)
4) Voila! Now you have a new email!
5) For stardoll, to change your email, go to "My Account" and put in your new email, or if you have never confirmed your email, press the button that says "Send Me a New Confirmation Link" or something like that!