If you have registered or it won't let you clear to start over and you haven’t paid, you can just abandon this account and start over with 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...
