I completed my return and printed it to mail a paper copy but have not filed it yet. I found an error. How can I change the return?

To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state. 

This will take you back to the 2020 online tax return to make any changes before filing.