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 with a lower priced edition. Click on Tax Tools on the left side of the program screen while working on the 2021 online tax return. Click on Clear & Start Over.
Otherwise contact TurboTax support for assistance with this Billing Issue
See this TurboTax support FAQ for contact support - https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632