@AlsoSmarterThanTheirDevs Do you want to make changes before you file or review it after filing? Either way you can go back in. They are just saying if you already filed be-careful not to change anything .
To change a return If you haven't mailed or efiled yet, see
https://ttlc.intuit.com/community/tax-topics/help/i-want-to-change-a-return-i-ve-printed-but-haven-t...
If you haven't efiled or mailed your return or it rejected you can go back in and change anything you want. Do not click on Amend!
Click on Add a State to let you back into your return.
From Tax Home (the first screen you see after you sign in), scroll down to Your tax returns & documents. You may have to select Show to open the drop down.
Select 2020, and then select Add a State (you're not actually adding a state, this is just the workaround).
Then when you are ready to file you can try to switch to efile.
https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online...
