After you file

If you mean a corrected W-2 Form, you can enter the form in TurboTax Online by following the steps below:

1. Sign into TurboTax Online
2. Click the orange button that says "Take me to my return"
3. Go to Federal Taxes then Wages & Income
   
4. Scroll down to Wages and Salaries and click Start/Revisit
   
5. Then enter the corrected W-2 information.