Are you in the last steps and referring to getting the email verification code to verify your efiling? If so, you can change the email address for receiving it. The steps are below. Or did you mean you cannot log into your Online TurboTax account at all?
FAQ: What if I'm having trouble with my filing verification code?
https://ttlc.intuit.com/community/security/help/what-if-i-m-having-trouble-with-my-filing-verificati...
If that's not helpful, please phone Customer Support.
Support hours are 5AM-9PM Pacific, 7 days/week.
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
NOTE: If you are using Free Edition, phone support is not included unless you upgrade to PLUS for a 29.99 fee. But you can contact a TurboTax Support agent for free directly via messaging at Twitter or Facebook.
https://twitter.com/TeamTurboTax
or
https://www.facebook.com/turbotax
