I need to add another W-2 to my routine

If you haven't already filed your return, can go back into your return to add your additional W-2:

1. Open (continue) your return if you don't already have it open.
2. Search for W-2 and select the Jump to link in the search results.
3. We'll take you to a screen where you can click Add a W-2 for [your name or your spouse's name].
4. Enter the information from the new W-2 on the following screens.

If you already e-filed, you'll have to wait until your return is either accepted or rejected.  The IRS is not accepting returns until Feb 12th, you will have to wait until then to amend your return.  

• If rejected, you can add the W-2 as described above before resubmitting or paper-filing your return.
• If accepted (or if you already paper-filed), you'll need to amend your return to add another W-2.