Yes, the mp9300 has axillary in. It has a pair of traditional RCA red/whites coming out of the back of the stereo.
I am assuming you are wanting to plug an iPod or Zune type device directly into it. To do this you would need to pull out the stereo to access the RCA inputs and add an RCA to 3.5mm adapter like
this one.These are commonly found at radio shack, best buy, walmart, or any electronics store for typically under $5.
After you install the adapter you can simply route it behind the stereo and out the back underneath a panel in the car so you can access it.
I have included a diagram of the wiring to help you out should you chose to decide to do this yourself.
Good luck!!