To add that additional W-2, you will need to wait until the IRS either accepts or rejects your return.
If accepted, you you will need to amend your return. This should be done after the IRS issues any applicable refunds. Refer to the following TurboTax FAQ for instructions on how to amend your tax return: How do I amend my 2019 TurboTax Online return? - Community
If your tax return is rejected, you can revisit your return to fix whatever caused the rejection. At this time, you can also add the additional W-2. How do I fix a rejected return? - Community
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