Click on "Edit My Profile" on right hand column, when you get to your profile page, click on the link that reads "To update name, title or company info, click here" that should bring you to registration profile page. Update your email there and click on Update profile.
Once you update your email address, remember the next time you log in you will have to use that email address.
Hope this helps,
where do i change it for mods usage only?