Since you have already submitted your tax return, wait until you receive an email informing you that it is accepted or rejected. Don't make any changes while your tax return is pending.
If your tax return is rejected, you may sign in to TurboTax and add your W-2 along with fixing the rejection. If your tax return is accepted, once it’s processed, you can file an amendment through TurboTax using Form 1040-X. adding your income.
For further information review the TurboTax articles: How to Correct Federal Tax Returns and Video: How to Amend Your Tax Return.
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