I have been trying to find guides on how to send keyboard inputs to the arduino from a pc using usb. I found this guide on the website http://arduino.cc/en/Tutorial/PhysicalPixel#.Uw5IYvl5NWN that guides you how to turn off and on a led using the keyboard. I dowloaded the program Processing as the guide said and installed it. The problem I have now is that I cant use the serial library. It cant find some Syntexs that should be in the library like http://arduino.cc/en/Serial/Begin#.Uw5jBvl5NWM.
Anyone got a fix on this problem?
Picture on the problem: