The White Balance, ISO and Exposure Compensation buttons are located on the handle, as is the front dial, which is used to navigate through menu features and select exposure parameters. When you select any of the three buttons, you can either navigate by using the touch screen or the dials atop or on the back of the camera.
Hint: To quickly select white balance, choose one of the manual WB settings, aim at a pure white, grey or black object in the scene, and press Select White Set on screen. Then hit the Menu/OK button, and your white balance is set.
Manual Video with GH3 camera
http://www.youtube.com/watch?v=AKZVDMsMsCw
More GH3 video tips
http://www.youtube.com/watch?v=RrLBJV4ttp0
Visual Narratives Resources 