After you file

Are you looking at the Online instructions?  The first step says sign in to your account.

 

  1. Sign into TurboTax.
  2. Go to the section titled Your returns and documents (you may need to select Show).
  3. Select 2019 then Amend (change) your return.
  4. When you get to the Let's get a kickstart on your 2019 amended return screen, carefully follow the instructions. Don't worry if your refund changes to $0. This is normal for amended returns.  When you have completed your amendment, the tax due, or refund, will reflect any change from your original return.