How do I update my federal tax return if I have not filed it yet?

If you haven't efiled or mailed your return 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 2022, 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/00/26985

Adding a state did not bring me back to the form the first time. I logged out and logged back in. It worked the second time around. Thank you!