Replaced Aux, now it is not working

Just changed the aux system in my car and now the aux won't show up in my car.

Before I changed it, the old Aux system had to have the wire adjusted to a certain place so the sound would go through. When it wasn't adjusted correctly, it would either only have sound on one side of the car or would go back to the radio.

Now that today, I changed it, it won't even show up in my car.