Just hit the set button (The current pwm percentage will show that its using in auto mode) and then hit and hold the green manual button for 3 seconds until the light comes on... Then use the blue arrow key to scroll to the digit you want to change to set your manual % value and hit set... Setting the temp is fairly easy hit the blue scroll arrow button to scroll to the digit you want to change than the up or down arrows to adjust the value and then hit "set" (yellow button.) The red (SV) digits are your desired temp set point or desired pwm % depending on the mode your in.