After you entered one address, hit Menu> Add Email.
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dang you beat me to it! i had read this thread and it was empty and i had to log in to post! lol
you are only allowed to add 2 more for a total of three, but a way around that is if you scroll all the way to the bottom where it says user 1,2,3, etc, you can rename those to additional email, and aim, etc.