If you have the AGI now, you can sign into your TurboTax Online account or open your return in the desktop software and go through the FILING steps again. This time when you go through the steps, update the 2019 AGI number. If you have already ''filed'' but used the File by Mail option, you can use the instructions here if you have NOT mailed your return yet.
If you need to contact a TurboTax agent, please see this link. @Fernando520
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