I wasn't able to efile my 2020 taxes originally. When I printed it yesterday, it said I can change my mind. It gave instructions on I cant find the "file tab" referenced

If you were unable to Efile and indicated you would 'file by mail' and printed your return for mailing, TurboTax considers that you already filed.

 

Click this link for info on How to Change from Mail to Efile.