If you didn't get the first or second Stimulus payment because your 2019 wasn't processed in time then you would claim it on your your 2020 return line 30. It asked you if you had got the Stimulus payment and you should have said no. Then your would get it on your 2020 tax return line 30. Did you have an amount online 30? If you didn't get it on line 30 you need to amend your 2020 return to claim it.
How to Amend
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
