Alexisindus:
Hello,I have a MEGA 2560, It's a card to an other project and I need to download the program for I can understand the operation of this machine.
Cordially
You have a funny idea. Most people understand as much as they do by doing.
You should start here: http://arduino.cc/en/Guide/HomePage
Soon enough you will be downloading TO the board which comes loaded with the example sketch named BLINK.