Welcome Emma! Prob best to post this question in the interior/audio section...but heres your answer:
If you must keep your factory fitted stereo, check out the renault tunepoint. A small box that plugs into the cd changer slot in the rear of your cd player. It then gives you usb/aux/ipod capabilities. Bear in mind that you wont get any display of track info, so its not the best method.
I have removed my factory stereo and fitted Alpines IDA range headunit that makes browsing the ipod an absolute dream! An adaptor also lets you keep the steering wheel controls, and the sound quality is a massive improvement over the factory stereo, even with the standard speakers.
Get your R27 number down in the register section and some pics if you haven't already!
Welcome to the club!
Antony :headphone: