The output at the back of the record player is RCA out. The volume is very low. If you use passive speakers, there will be no sound.
You need to plug the cable into your amplifiers or your home theater/HIFI system to the AUX-IN. Then, turn up the volume and you would be able to hear the music come through. Alternatively, you can connect it to active speakers. Active speakers are speakers that come with external power supply and usually has a volume knob.