If you have not yet submitted your return, you can enter W-2 information into TurboTax by taking the steps below:
1.) Federal
2.) Wages and Income
3.) Wages and Salaries
4.) Click through the screens until you see a screen called Here's Your W-2 Info
5.) Click on Add Another W-2
If you haven't yet entered a W-2, I don't believe you will see steps 4 or 5. It should just prompt you to add a W-2.
If you have already submitted your return: if it gets rejected then you can go in and make the necessary changes. If it is accepted, you will need to amend your return after you have received your refund. The FAQ below will take you to a guide with the instructions on how to amend.
https://ttlc.intuit.com/replies/7276605
