Here is what I did:
1. Download the app to your phone.
2. Launch InControl Apps app on your phone.
3. Tap and slide the InControl main screen (on the phone) down, you should see a spinner showing for a while, once the spinner disappears, justDrive app should show up in the top row called "New apps".
4. Finally add justDrive app to the layout.
5. Plug your phone into the car.