To change the backlight color of your RGB RK61 Royal Kludge keyboard, press the Function (FN) and Arrow keys together to adjust the light brightness or glowing speed. Press Function (FN) and numbers 1-9 to change between the different custom lighting modes. Pressing Function (FN) and scroll lock keys together to scroll between the various solid backlit modes. Press Function (FN) and Page up key together to select the color you want.