DDR Max help!

Hello! I just purchased DDR Max (dance dance revolution max) and with it also a MYMYBOX Dance pad so it could be just a bit more fun. Well, after setting it up (well, putting in the bateries in the mymybox machine so the dance pad would light up and inserting it into controller slot number 1) my game would not respond to the dance pad. What am I doing wrong? I need help!!!