How do I update my TurboTax account information?
To update the information in your TurboTax Advantage account, see this article instead.
Otherwise, go to My TurboTax and sign in (or, if you're already signed in to your online tax return, click My TurboTax at the top).
In the Tax Timeline window, select Account Settings from the My Account drop-down in the upper right corner (enlarge the window if you don't see this).
This will open the Review and edit your account info page, where you can update your User ID, password, name, email, security question/answer, billing/shipping info, and payment information.