I had 2 jobs in 2021 both with separate W2’s I already filed one but just received the other one. How do I file again?

[TerukoL]

Once your return has been accepted, you will not be able to make any changes until after your refund has been processed. Amending your return means filing a new form, 1040X. How to amend (change or correct) a return you've already filed to learn more. 

You should not try to amend your return until it has been fully processed and you have received your refund or your payment has cleared.

Amended returns do not “catch up” to your original returns and replace them.  They are processed as two separate returns.