how do i start over?

If you have not registered, paid or e-filed you can clear and start over 

CLEAR AND START OVER

https://ttlc.intuit.com/turbotax-support/en-us/help-article/change-service-level/clear-start-turbotax-online/L37BZFuBV_US_en_US?uid=m6b26ost

If you have not paid for the online edition you are using, have not filed your tax return or registered the Free edition, then you can clear your return and start over. Click on Tax Tools on the left side of the program screen while working on the 2024 online tax return. Click on Clear & Start Over.