After you file

Contact TurboTax Support to find out how to begin a 2023 amendment if it is not apparent.

you probably would not be able to e-File 2023 Form 1040-X with TurboTax, although one forum participant  claimed success.

 

You don't need that.

 

Start a New Return and make an  IRA contribution. Print the form.

Then proceed as I said above