Turn the phone over to where the battery compartment resides.
Remove the battery compartment door by pushing down on the door with your thumbs and sliding the door off of the bottom of the device.
Remove battery.
Use a Phillips #0 screwdriver to remove the screw in the middle of the battery compartment.
Pry open the case body with the plastic opening tool. Start at the bottom of the device and work toward the top. You will hear a "click" sound as the sides open.
There is a wire connector linking the front and the back of the device.
Carefully pull the wire connectors out of the white connector gauge to completely separate the front and back pieces.
The power button may fall off when you separate the front and back of the device. This can simply be placed back when reassembling.
Find the lever on the right side of the back half of the device.
Insert the tip of the lever into the square indent on the underside of the button.