How do you unregistered and erase my return to start over?

[ee-ea]

The IRS will start processing returns on Feb 12. Until then TurboTax will hold your pending e-filed return. Pending returns can not be changed. If the return is accepted you will get an email. If the return is rejected the e-mail will tell you what to correct and you can make changes before

e-filing again. Amend to change an accepted return. Instructions below. https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...

[AlanT222]

You cannot unregister.  Once you have submitted payment, deducted the TurboTax fee from your refund, or registered, you cannot erase your return and start from scratch in TurboTax Online.

[VolvoGirl]

Or if it doesn't let you clear and you haven't paid and filed you could just start a new account.  Online is only good for 1 return per account.  But you can use the same email address for 5 accounts.   How to start another return in the Online version

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...