Aux and USB inputs not working

Hi all,

I recently bought a 2011 Subaru Impreza with a touchscreen stereo. I found that it had no Bluetooth streaming which disappointed me. I thought at least the aux located in the centre consol would work, but it doesn't. Not sure if it's a setting. Please help!! Also how do I set up Siri eyes-free? I have a button on the steering wheel which does nothing.