@jdeisz535
The "Add a State" selection is only available when the tax software for that particular year is operational.
Thus, when TTX shut down the Online software for 2021 tax returns (~ the end of October of 2022), that process was also eliminated.
NOW if you need to get back into your 2021 "Online" tax return to either modify something, or to add in something in an unfinished 2021 tax file...or amend a previously filed 2021 tax return,
.....you must now download/install/use the full desktop software to do anything with that file.
Once you install the desktop software on a full MAC or windows computer (and must then install any state(s) that are in your online file).....you can then download the existing .tax2021 datafile from yoru Online account and open that with your desktop software .
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the "Online" software shtus down every year during October..usually late October. All changes have to be made before that shutdown date. You can still make changes/additions/amendments after that date...but only if using the desktop software.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
