Help me play music at work?

Hello, I am new here. I am not sure if this post is in the right spot and apologize if it is not. I do not know much about PA systems.

At work, we have 1 huge system that controls the TV, microphones, and volume of the music. I am trying to play music from my phone via pandora, and have it broadcast through the speakers at my bar. I was wondering if anyone could help make this happen? I can take pictures of our system and upload them. I've looked for an aux input and tried USB, but nothing happens. Thanks for your time!