After you file

Thanks for the reply.  I did fill out a 2020 non filer return, but I used the Free File Fillable Forms Tool as suggested through the IRS.gov website. I understand nothing is needed for the 3rd check, I assume they will figure that out. But for the 1st and 2nd how do i get those checks since I didn't put any info in the Recovery Rebate Credit box? Again this is for the child, not me, I got my checks already.  

 

Also I never claimed the child on 2019 non filers tool. How does that effect the checks I should have received?