I just received another w2 form from an employer after filing my taxes. What can I do?

[HelenaC]

If the IRS rejects your E-Filed income tax return, you could add the tax form.

If the IRS "Accepts" your income tax return, you will have to amend your income tax returns. Wait for the IRS to process your income tax return before you amend it.  If you are expecting a refund, check for the status at  Where's My Refund? - It's Quick, Easy and Secure. - IRS.gov

See How to Amend (Change or Correct) a Return You Already Filed to amend your income tax return.