I’m trying to restart and I don’t know how to

If you have not paid or registered your TurboTax account, you can Clear and Start over.

Or if you have registered but haven't paid any fees you can start over in a new account.

The Online version is only good for 1 return. But you can use the same email address for 5 accounts. To do another return log out of your account and set up a new account and new user name.

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-online/00/25596