It is to late to file a 2020 tax return for the Economic Impact Payments available in 2020. The last day to file the 2020 return for a refund was May 17, 2024.
You can still file a 2021 tax return for the Economic Impact Payment 3 available in 2021. Use the Recovery Rebate Credit section of the tax return for the $1,400 credit.
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.