pc keyboard with arduino?

dhunt:
With the Uno you can reprogram the atmega8u2 or atmega16u2 (rev 3 Uno) to be a USB HID keyboard. Check the links here in the playground: Arduino Playground - InterfacingWithHardware.

Guys, I bought the arduino UNO rev 3 just to do something more of a simple pc-keyboard. So i would like to know how I can install this on my arduino: http://hunt.net.nz/users/darran/weblog/b3029/Arduino_UNO_Keyboard_HID_version_03.html
Can someone give me some instructions please?
Thank you very much!