GUI Joystick

I've followed the tutorial found here: https://www.assetstore.unity3d.com/en/#!/content/21028

With great success I've created a survival shooter, however, now I want to be able to implement it on an Android device in terms of using a joystick instead of the keyboard to move about. Within the downloaded project there is a MobileInput folder with scripts capable of doing this, but I'm not sure how/where to implement them. I'm also struggling to change the script so that the player responds the the joystick, not the mouse/keyboard.

Does anyone know if there was a tutorial done on converting/building this project from mobile?