The GearVR controller is a simple controller, perfect for exploring 3D models on the GearVR. Unlike traditional bluetooth controllers the GearVR controller has a gyroscope that allows for motion by aiming it with your hand.
GearVR controllers are included with all new 2017 GearVR's or can be purchased from Samsung.
For help pairing your controller to your phone please see the help article from Oculus.
These are the controls for the GearVR controller in InsiteVR. You choose your locomotion option (walking, flying, or teleporting) via the VR Menu. You can open the VR Menu either by pointing at it with your controller and pressing the trigger, or by pressing the left button on the controller.