If you want change the email address on your ZAGG.com account, please keep in mind that you will also be required to change your password.
Once logged in and in your account dashboard, click "Account Information"
Expand the "Reset Password" drop-down to expose the password boxes.
Enter your new email address and enter your new password on the top two boxes. Passwords must be at least 7 alphanumeric characters. Then enter your current password on the bottom box.
Click "save" and you're all set.