In the Emails section click EDIT.
Click '+ Add Email'
Enter the email address you wish to use and click Next.
You are now prompted to configure email sync (if active on your account). Enter the information or uncheck the 'Synchronize' check box and click Add.
The new email address is now associated with your account.
You can now remove the incorrect email by clicking 'X' in the Action section for the old email.