Think you mean the head end rather than CD player ?. If it's the headend you push out the four or so lugs that hold it in round the edge. Normally you use little metal bits that get supplied with car radios for this, failing this you need to improvise [looking at the front of a CD case whether that could be chopped up into strips and slid in the gap, get the idea], each lug is held out of the way then you pull the unit forwards.