How do I file a 2020 W2-C?

[DawnC]

Your employer has sent you a corrected W-2.   If you already imported or entered your W-2 and you haven't yet filed, go back and edit your W-2 with the corrected info from your W-2c.

And if you already mailed your return, or it was accepted, you may need to amend.   

[Mike9241]

have you already filed your 2020 return?