Reply to I cannot hear left cue and right cue??

Can somebody give me a lil tutorial on how to set this up... I've been trying and its just not working for me... I wanna be able to hear the next song so I can mix it right but for some damn reason I just can't get it to work .... I keep moving the audio around and it just doesn't work.. HELP!!

p.s I need it to work before sunday I got a GIG!!!