You can add two W-2 forms by (make sure you are logged into your TurboTax account):
1. Clicking "Take me to my return"
2. Clicking the "Search" button in the top right hand corner of your TurboTax screen and search for "W-2"
3. Clicking the "Jump to W-2" search result
4. Clicking the option to "Work on my W-2 now" and clicking continue
5. Follow the on screen instructions from TurboTax to enter both W-2s.