Instructions
Turn your PSP Slim around so the rear panel is facing you. You will clearly see the outline of the UMD door on the back of your PSP Slim.
Press down on and then use your finger to pull open the UMD door. Pull it gently away from the back of the system. This will reveal the PSP Slim&'s UMD disc tray.
Insert a game or movie into the disc tray and then close the door with your finger. Once the door is closed and your system is on, the disc will automatically load onscreen.