Unscrew the 2 small Phillips screws that hold the 2.5" bay cover and the Ultrabay slider in place.

The 2.5" bay cover should now come loose, so pull it out. Under the ultrabay drive, you will find a small slider. Slide it in the direction shown in yellow and a tab should pop out.

Pull both the 2.5" and the Ultrabay drives by their respective tabs, shown in green.