HELP configuring multimix 4 usb fx in cubase le8

i got a multimix 4 usb fx for christmas my computer is an i5 desktop with 8 gb of ram running windows 8.1 my DAW is cubase le (it was bundled wit the mixer) I cant even use this stupid mixer cause every time i try to record vocals it records the instrumental thats on track one into track two. Why does this come bundled with Cubase if it doesn’t work correctly?