xdj rx and macbook connection

hi i just got my mac book and I'm trying to hook it up to my xdj rx. i connect it via USB then i press the midi botton on the xdj rx, the xdj rx screen message tells me to press the load botton on the xdj rx. after that I'm stuck i don't know how to get music to play from my mac to my xdj rx can someone help me,