To access your prior year return, you would need to upgrade your account to Plus. To do so, make sure that you are in your account. Select Take me to my return (if you haven’t already), then Upgrade in the left-hand menu and choose Plus. Select File in the left-hand menu and continue until you get to Review your order. Then select Start and follow the on-screen instructions.
https://ttlc.intuit.com/replies/5574744
Please follow the instructions listed in the following TurboTax FAQ to contact Customer Support if you need further assistance. https://ttlc.intuit.com/replies/3300041