If you could be claimed as a dependent on the 2020 and 2021 tax return you were not eligible for a stimulus payment.
If that is not the case then you need to file a 2020 and 2021 tax return and complete the Recovery Rebate section of the tax return.
To complete and file a prior year (2022 thru 2020) 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 prior year tax return can only be printed and mailed, it cannot be e-filed using TurboTax.
Use a separate envelope for each tax year being mailed.