Sorry, you are too late for the 1st or 2nd stimulus. The deadline to file a return for those was May 17, 2024.
If no one could claim you as a dependent for tax year 2021, you can still file (or amend) a 2021 return to get the 3rd stimulus of $1400 as a recovery rebate credit.
There is no place on a 2024 tax return to enter anything about stimulus checks.
Look at your online account with the IRS to see if they sent you $1400 in 2021.
https://www.irs.gov/payments/your-online-account
If you could be claimed as someone else's dependent in 2021, you are not eligible for the payment.
If you were eligible and do not receive a payment soon from the IRS, the other way to get the payment is to file or amend your 2021 return to use the recovery rebate credit before April 15, 2025. If you did not file a 2021 return at all, then prepare one and mail it in.