In order to install the application you must download the app and allow the install to begin. After selecting install, you will see a blank browser. On the home screen, you should now see the app icon indicating that the app is installing. Once the app install finishes, launch the app.
You will then see a message indicating your device needs to establish trust with our development application. In order to do so follow these steps:
Tap Settings > General > Profiles or Profiles & Device Management. Under the "Enterprise App" heading, you see a profile for the developer. Tap the name of the developer profile under the Enterprise App heading to establish trust for this developer. Then you see a prompt to confirm your choice.