MP3 player grove

i want to play a music from a sd card thanks to the mp3 grove shield player but i don't find any code can you help me ?
Thank you

Did you look at the code on their website?

Yes i use this code in fact but i don't understand how to use the serial monitor for the commands

i wantto play music on the speakers through arduino from sd module.
the code given in the arduino home
link http://www.arduino.cc/en/Tutorial/SimpleAudioPlayer
is showing an error while compiling
pls help
thanks