Please see the instructions below, on how to get back into your return to make changes:
- In TurboTax Online, sign into your account.
- Select Tax Home in the left menu.
- Scroll down to Your tax returns & documents.
- Select 2018, and then select Add a State (you're not actually adding a state, this just gets you into the right menu). You can now choose the menu, you need to make changes in.