If it is the original fiat radio, there should be 4 small small holes in each corner. Push something small such as an alan key into these holes and once you have done the last, the radio should pop out an inch or so. From here you can fully remove it by pulling it out and detaching the cables. Be ware, when installing the new radio/cd player the old 'cage' might need to be removed and a new one supplied with the player will need to be inserted.
Jon, June 2006