Since you have already submitted your tax return, wait until you receive an email informing you that it is accepted or rejected as xmasbaby0 indicated. 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. Refer to the TurboTax article What is the IRS 1040-X Form?
For further information review the TurboTax articles: How to Correct Federal Tax Returns and Video: How to Amend Your Tax Return.
If you live in a state that requires you to file an income tax return, don’t forget to prepare an amendment for your state. For instructions to amend your state return, refer to the TurboTax Help article How do I amend my state tax return?
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