If you have not filed your tax return, you can add a W-2 using the instructions below: "
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On the Tax Timeline menu at the top of the screen, select "Federal Taxes".
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Select "Wages and Income" underneath on the second menu bar.
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Select "Edit/Add" next "Job (W-2)" to view a summary of all W-2's entered on the return.
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On this screen, select the "+Add another W-2" button to add income.
If you have already filed your tax return, you must wait until the IRS either Accepts or Rejects your original tax return before amending to add the additional W-2.
Instructions for amending a return in TurboTax Online can be found here:https://ttlc.intuit.com/replies/5567856
Once the return is available for amending you can use the instructions from above to add the W-2.