Xdj-rx livestream headphones

so ! i have a big problem , i wanted to do live mix on facebook and on youtube so i downloaded Camera Recorder Lite + OBS , so i pluged in to my mac usb cable and conectet with the xdj-rx put the MIDI button and open Rekordbox so the problem is , then i open the camera recorder obs and redkordbox then i press the play button and i can only hear the sound comming only from my laptop i was trying to change something in the rekordbox settings but its doesn't work at all ! so like i said i open everything and play then the sound is comming only from the program camera recorder lite sk from the laptop but not from the headphones because its to hard mixing without headphones , please help me ! and sorry for my bad english ! thanks