How do I get into the adjustment submenu on my SmartMaxx-DHWPlus controller?

How do I get into the adjustment submenu on my SmartMaxx-DHWPlus controller?

Press the “+” button to move through the main menu (Display Channels) until you reach the last item in the main menu. Then press the “+” for about 3 seconds straight until you access the submenu (Adjustment Channels). The first code displayed will be “Arr.”