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I just registered a few minutes ago. I would like to use a different e-mail address than the one I registered with. I have searched and cannot find out to do this. Can you please tell me how? Thank you.

Login and open your account. You can change your email there. Just remember to save your changes.

Actually, I tried that, both by going to "my profile" and "your account" and I see no means to change e-mail. Am I missing something?

If you can't change your email yourself, you'll have to contact support.