In the Master Bathroom: First, use the middle knob to turn the shower on. Second, use the top knob to select the shower head from which you would like water to flow. Finally, use the bottom knob to select your water temperature – turn towards the red for hot, and the opposite direction for cold. All other showers: First use the large handle to turn the shower on. Second, use the smaller knob in the middle of the large knob to determine your water temperature.