Tax years 2019 and 2020 are no longer supported by TurboTax. File one of those tax returns for tax refund, the refund will not be paid since it is beyond the 3 years from the due date of the tax return.
To complete and file a 2021 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2021 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2021 tax return can only be printed and mailed, it cannot be e-filed using TurboTax.
