I need to amend my 2020 Federal Tax Return already submitted

I filed my 2020 Federal Tax Return using Turbo Tax. It was accepted.  My stimulus check was sent to previous address.  IRS says if you did not receive your $600 check, take a $600 tax credit.  I need to amend my 2020 Federal Tax Return I submitted thru Turbo Tax 3/05/2021.