To change the email attached to your MV account:

1. Go to your drop-down menu
2. Settings 
3. Locate the section named "Account" and click "View".  
4. Then, locate the section named "Email", here, you will be able to enter a new email address (make sure that it isn't one already in use on MV). 
5. To save your changes, enter your current password and hit <Save>.