For instructions on resetting your TurboTax password and updating your contact information, please review the FAQ: How do I update my TurboTax account information? https://ttlc.intuit.com/replies/3301500
To change your phone number you can sign into TurboTax and go to
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.
If you want to change the phone number on your Tax Return, you can go to the Personal Info tab and change your number there.