The stimulus payments from 2020 are no longer available.
If you were a dependent on a 2021 tax return then you were not eligible for the 2021 stimulus payment.
Check your IRS tax account to see if a stimulus payment was ever sent to you - https://www.irs.gov/payments/online-account-for-individuals
If you were eligible for the 2021 stimulus payment but the IRS never sent the payment then you will have to complete a 2021 tax return and go through the Recover Rebate Credit section of the return for the $1,400 stimulus payment (EIP3)
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.