You actually can't file your 2019 and 2020 tax returns together. Each return needs to be prepared separately.
You will prepare your 2019 tax return using the desktop version of TurboTax. Please see the link below to access this software.
Prior-year tax return information
You will need to mail in your 2019 tax return as electronic filing is only supported for 2020 income tax returns.
Can you e-file a tax return for an earlier year
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"