TurboTax is DIY tax preparation software. There is no assistance for prior year tax returns.
To complete and file a 2020 and 2021 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the desktop editions for each tax year required from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2020 and 2021 tax return can only be printed and mailed, they cannot be e-filed. When mailing the tax returns use separate envelopes for each tax year.
You should seek out a local tax professional for assistance if you do not want to use the tax preparation software.
