The instructions that DoninGA gave you are for amending a tax return that you filed yourself with TurboTax. If a tax preparer filed your tax return for you, you should go back to the preparer with the W-2 that was omitted and have the preparer file an amended return for you to add the missing W-2. Trying to file an amended return yourself with TurboTax, if you did not originally file with TurboTax, would be difficult for you.
