1. Click on Your account and select Your profile. 
2. Click on "Change" next to email address. 
3. Enter your new email address and click save. 
4. You will receive an email to confirm your new address. 
5. Click on the link and that should send you another email confirming the change (subject line says "Account information changed"). 
6. Sign out from the current session and then login with your new address.