Need help with DMX.

Hi, i found this awesome project for receiving ArtNet data and light up LED conected to PWM pins. The thing is i want to implement DMX over serial port. For i can see in the code the only thing i should do is include the DMXSerial library and put that dmx info already in the code and send it. Easy eh? the other thing is that i suck at coding, i spend hours to do this and i fail, so i would love for any help (Im usind the ArtNet Led example sketch).

ArtNet Library

DMXSerial Library