How to fix my aux kit problems?

Hello all.
Not too long ago I bought a 2003 Honda Accord. The car is obviously not made with Bluetooth or even an auxiliary input, but the previous owner apparently installed an auxiliary kit in the car. But it s a little problematic:
Firstly I ve been hearing a high pitched wining sound and sometimes even static when I play music via my iPhone.
Secondly playing music through the radio is awesome, but it s a hassle to switch tracks because the radio controls don t allow me to skip songs (so I have to unlock my phone to do so). What are my options? What should I do?

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