If the IRS accepts your return, then you have
to wait until it has been fully processed and you have received your
refund. THEN you can prepare an amended tax return 1040X and mail it
in. You cannot e-file an amended return. Meanwhile, DO NOT change
anything on your return until you start the amended return.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
