Amending a tax return requires you use the TurboTax product from the year you need to amend. Did you use TurboTax in 2019? If you did you can use it to amend your 2019 tax return with that program, please see this: How to amend (change or correct) a return you already filed
If you did not use TurboTax in 2019 you can obtain the form here: About Form 1040-X, Amended U.S. Individual Income Tax Return
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