If you have submitted your return, you will need to wait until it's accepted or rejected. If it's rejected, simply correct and re-submit. If your return is accepted, you will need to submit an amendment Form 1040X.
Please see follow the amendment instructions in this FAQ: https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
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