There are 2 screws needed to be removed, marked in red. Using a screw driver, remove the bottom screw and unscrew the side one. The side screw is self retaining.

Once you have unscrewed both screws and the SSD lifts up at about a 15 degree angle, slide the SSD out. You can either grab it by the SSD or by the holster it is in. The holster might slide off of the SSD if you do not grab the SSD as well.