If you
have already filed your returns this year, you can't go back and add any information. You will need to wait to see if
your return is accepted or rejected. If
rejected, you may correct and resubmit. If it is accepted, you will need
to file an amendment, and that
will not be ready until mid-February.
When the amend instructions have been posted and form
1040X finalized, they will appear in this TurboTax FAQ:
https://ttlc.intuit.com/replies/5114064