If you did transmit your return you will not be able to make any changes to it until it is accepted or rejected by the IRS. The IRS will start processing returns the end of January.
You can check the e-file status of your return by clicking here: Check your e-file status
If your return is rejected, just go back into your return to add your information. If the IRS accepted your return you will have to amend your return.
If your return was accepted you will need to amend it to include the additional income. Please see the following FAQ for information on amending a return you already filed: How to amend (change or correct) a return you already filed
[Edited | 4/9/2020 | 11:27am PDT]
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