When you sign into your TurboTax account, you select "My TurboTax" then "Tax Timeline".
Scroll down and under Some things you can do - you can choose to add a state return, you aren't really adding one, just gaining access to your return. Be sure you don't make any changes to the original return in case you want to amend it. the original return needs to be intact before you would begin that process. (see image attached)
