The Cloud 9 Comfort Saddle With Light-Bar has an LED light built into the back of it.
The first thing you need to do is remove the clear plastic tab that protects the batteries during shipping. Simply grab it and pull toward the nose of the saddle to remove it and allow the batteries to contact the terminal for the light.
To turn the light on, press the On/Off button. The light has two modes, steady and flashing. To cycle through them, press the On/Off button.
If you need to replace the batteries, unscrew the cover and replace the old batteries with 2 new CR2032 coin-cell batteries.