Cytron Easy MP3 Shield, Decode and Play MP3 for Arduino, Dual Channel, 3.5mm Audio Jack

After installing the library for this board on the Arduino IDE and installing the MP3s, as set out by the instructions on an SD card, it still does not work with Arduino. However, it will play back the MP3s when the buttons are pressed on the board itself, and the audio sound quite good, but after running it from two different computers with the latest ver. of IDL, it won't work.