As long as you have not transmitted and your return has not been accepted by the IRS then you can go back into the TurboTax program and make any changes you want. Use the tabs on the left side of your screen. If your return has already been accepted by the IRS you will have to amend to make any changes.
Go here in TurboTax:
- Federal Taxes (Personal if using TurboTax Home and Business)
- Wages & Income (Personal Income in Home and Business)
- Wages and Salaries
- Wages and Salaries
- Start or Update
You will then see a list of each W-2 on your return and you can delete if you see a duplicate.