How do I customize the RGB backlighting effects on the M1w keyboard?

Use the Fn key combined with the backlight setting keys to adjust lighting effects. You can use Fn+- and Fn+= to control lighting, and shortcuts like Fn+Home, Fn+Del, Fn+PgUp, Fn+PgDn, Fn+End, and Fn+L to adjust various backlight parameters. The backlight shortcut allows you to set the backlight color to 7 single colors with an RGB loop effect.