[dirtydog]

There is no aux in for that stereo, Viney is correct the only way is with an FM transmitter and tbh they're not great still suffer from interference though.
I'm using a tunebase one in my mondeo and it does the job but hte sound isn't great.

Next car will have a proper aux in/ipod interface stereo in it. Can get stereos fairly cheaply now with aux in but then you'll need some ISO leads, fascia panel, a lead to plug your mp3 in and if you have steering wheel controls they wont work unless you buy a more expensive stereo and then you need patch leads to connect the ford plug to the stereo socket