We can change that for you. Please log in and use the "Ask the Teacher" Form in your course. The "Ask the Teacher" link exists at the top of the course page in the "How to Take This Course" block.
Please include the:
1. User name on the account
2. Current Email address being used
3. New Email address you want to use instead
Important: We can only update an email address if the request comes from either the "Ask the Teacher" form OR from the current email address that is used on the account.