Step One:
Unplug Your Xbox 360 Powers Source. Place your fingers into the USB ports, and then place your thumb on the bottom of the Xbox 360 console and pull the face plate completely off.

Step Two:
Now, flip the Xbox on its side and take a close look at the holes located on the top and bottom of each side. If you look closely, you can see the gray tabs towards the ends and in the center of the Xbox 360. These gray tabs are what hold the top and bottom pieces on the Xbox 360. To remove the top and bottom gray pieces, you will need a small pointed object as pictured below.