you don't need TurboTax.
get the 2020 and 2021 Form 1040 from IRS.gov
Put the stimulus you did not get on Line 30.
fill out the remaining lines 31-35.
sign and mail them via US Mail in separate envelopes.
The first stimulus checks were issued in 2020; the first one was for $1200 for adults and $500 for qualified children dependents under the age of 17. The IRS was in a hurry to send out those checks so they sometimes used information from your 2019 return to send out the check. Or sometimes they sent it after you filed your 2020 return.
The second stimulus was sent in late 2020 or early 2021; that one was $600 per adult and $600 for qualified children dependents under the age of 17.
The 3rd stimulus check was $1400 for adults and $1400 for any dependent you claimed, and was sent out in 2021.
If you did not receive the first or second stimulus check, you can get it by filing a 2020 return and use the recovery rebate credit in Federal Review. The stimulus amount will show up on line 30 of the Form 1040.
If you did not receive the 3rd stimulus check, you can get it by filing a 2021 tax return and use the recovery rebate credit in Federal Review. The stimulus amount will show up on line 30 of the Form 1040.
Check your own bank account for deposits of the stimulus checks, and check your online account with the IRS to see what the IRS shows they sent to you.
Try checking your online account with the IRS (and if you filed a joint return—check for BOTH of you)
https://www.irs.gov/payments/your-online-account
The recovery rebate credit is based on whether you were eligible in 2020 or in 2021; if you could be claimed as someone else's dependent for those tax years you were not eligible then and will not be eligible now.
2020
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
https://www.irs.gov/instructions/i1040gi
https://www.irs.gov/pub/irs-prior/f1040--2020.pdf
https://www.irs.gov/pub/irs-prior/f1040s1--2020.pdf
https://www.irs.gov/pub/irs-prior/f1040s2--2020.pdf
https://www.irs.gov/pub/irs-prior/f1040s3--2020.pdf
2021
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
Here is the IRS 2021 Form 1040
https://www.irs.gov/pub/irs-prior/f1040--2021.pdf
or if you want bigger type use 1040SR for Seniors,
https://www.irs.gov/pub/irs-prior/f1040s--2021.pdf
And 2021 Instructions
https://www.irs.gov/pub/irs-prior/i1040gi--2021.pdf
2021 Tax and EIC Tables
https://www.irs.gov/pub/irs-prior/i1040tt--2021.pdf
Sch 1 : https://www.irs.gov/pub/irs-prior/f1040s1--2021.pdf
Sch 2 : https://www.irs.gov/pub/irs-prior/f1040s2--2021.pdf
Sch 3 : https://www.irs.gov/pub/irs-prior/f1040s3--2021.pdf