You can change your email address in the Account Settings, which is at the very bottom of the left side menu in TurboTax Online.

The account setting’s doesn’t work. I need to update my name as well. 

If you are having difficulty in your settings, we believe your best option is to contact our telephone support team for further assistance, as they have the option to view your screen to help resolve the issue. To contact them, please follow this link: Contact Us. When asked if you wish to receive an email say NO then say "speak to a representative" then hold the line.

​​​​​​​Thank you for choosing TurboTax.