Please follow the instructions below:

1. Login to your TurboTax Account 
2. Click “Take Me To My Return”
3. Click on the Search box and type “W-2”.
4. Click on “Jump to W-2”.
5. On the "Here's your W-2 info" screen click on “Delete/Trash icon” next to the W-2 you wish to delete.

Please see this FAQ for additional information:

https://ttlc.intuit.com/replies/3288508