If you were not a dependent on a 2020 or 2021 return and did not receive the stimulus payments you will need to file a 2020 and 2021 tax return and complete the Recovery Rebate Credit section.
You should also check your IRS tax account to verify that the IRS has not already sent the payments.
Go to this IRS website for a tax account - https://www.irs.gov/payments/your-online-account
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 using TurboTax.
Use a separate envelope for each tax year when mailing the tax returns.