How to connect my mixer with MIXVIBES?

Hello to everybody!
Sorry if this question has been posted before but if possible I would like to enlight me in How Can I Connect a simple 3 Channel "TELE" mixer with the software!
The main thing is that I want to listen through my mixer the left channel for example when the right is one the air so to be able to know when make the crosfading etc...In other words I would like to set the bpm and the cue time etc...through the software but make the mixing analog with the mixer!
Thank you in advane...!
P.S. The question is placed mostly because I can't listen when using the software only what each channel plays when is off air..!
Sorry if this question has been posted before but if possible I would like to enlight me in How Can I Connect a simple 3 Channel "TELE" mixer with the software!
The main thing is that I want to listen through my mixer the left channel for example when the right is one the air so to be able to know when make the crosfading etc...In other words I would like to set the bpm and the cue time etc...through the software but make the mixing analog with the mixer!
Thank you in advane...!
P.S. The question is placed mostly because I can't listen when using the software only what each channel plays when is off air..!