Micra C+C mp3 upgrade?

Hi all,

I'm a bit new to the Micra.
I have just bought a C+C 1.6 Essenza. it comes with a 6CD multichanger, my question is there an upgrade / patch lead to convert it to play mp3's? or i already have a FM modulator wired into my mini, is it easy to get to the aerial socket behind the dash? so i can plug this in?