How to set my car to play music through my phone?

I have an LG G3, and my car is a 2007 Ford Fusion S.
I have an auxiliary cord in my car already, but every time I hook it up to my phone, it just plays the music on my phone instead of through the Aux setting. I don't have a Bluetooth button on my car, or it I do, and I can't find it. I was wondering if there's any way I can set my car up to play the music on my phone, because of the fact that it's not working on my auxiliary.

How much should I pay for a decent cord?
@HealthyMan

Try getting a better quality cord. I had the same problem with a cheap cord. After I bought one of better quality everything worked fine.

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