3rd person controls on iOS

Hi, I'm trying to get 3rd person controls which would work by tapping and dragging the character around to lead them where you want to go.

As this is my first time using C# for iOS, I have no idea how to go about it so I am currently using the CameraRelativeSetup scene that comes in the Standard Assets (Mobile) folder.

This works fine, except the character is being controlled by the left joystick and I would like it to ideally work the same way but by dragging over the character. Is there any way to essentially use the same code but move the area over which it works?

Thanks for any help in advance! (ps. I can post the Joystick code here if it helps but it's so long I thought I better not, plus it comes bundled with Unity anyway!)