How do I get my SmartMaxx DHWPlus controller from Celcius to Farenheit?

How do I get my SmartMaxx DHWPlus controller from Celcius to Farenheit?

Push the “+” button until you move to end of the main menu (time). Press the “+” button continuously for about 3 seconds to get into the adjustment submenu. You should see “Arr.” Temperature scale choice is near the end of the submenu, so keep pushing the “+” button until you see “UNIT.” When you get there, press the “OK” button once. “SET” will start blinking on the screen. Press the “+” button once, and Celcius will change to Farenheit. Push the “OK” button again to make the change permanent.