For 2021 since it is already late you will have to --not may have to-file an amended return.
Try it .
OR if you are filing late, then go to the VIEW tab on the top of the TT, click and again click on forms.
A window with working copies will pop up.
go to the relevent location on the 1040 form. Click OR override IF ARE IN THE process of filling the form.
Yry this
One of the methods should work.
