You don't actually file a Form W-2c in TurboTax. You use the information on it to modify the original W-2 that's being corrected.
Assuming that you've already entered your original Form W-2 and you haven't yet filed, go back and edit the W-2 with the information from your W-2c.
See the TurboTax Help article I got a W-2c from my employer. How do I handle this? for guidance.
After you've entered the updated information, you'll see the Let's check for uncommon situations screen. Select the box next to W-2 was corrected by my employer (Form W-2c), then select Continue.
