Cheddar

Hi.
So I just bought a new car a couple weeks ago. When I say new I mean seriously used, but it came with a pretty nice stereo with a nice setup so I can hook up my subwoofer without doing any wiring.

BUT.. the JVC stereo is a quite simple model idk what model it is cause I'm not exactly an expert on this field, but I have been around enough of them so I always find out how they work. My problem is that the sound is all messed up. I cannot for the life of me find out how I setup/tweak the sound. I have tried almost everything and I cant find the menu where I can turn bass up and all the high-pitched sound down. If I would be able to change these setting I'm positive that it would be 100% better.

So here's a picture that I just took of my car stereo and I have my fingers crossed that one of you guru's in here can see what model this is and maybe even tell me what I need to press and do to get in the audio-settings--
Thanks in advance. How do I get in the audio settings menu?