If you have already filed your tax return, you will have to wait until the IRS either Accepts or Rejects your tax return before you can amend or edit the information filed.
Please see the instructions in this link for more information: https://ttlc.intuit.com/replies/5624594
If you have not filed the return, you can add your W-2's using the instructions below:
To add a W-2:
- 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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On the next screen, select the " +Add a W-2" button to add a new W-2 form.