Apple's iMac desktop computers feature a sleek design with most of the input drives and jacks hidden from view. As part of this design scheme, the iMac does not have a front-loading CD tray like many other computers. Instead, the iMac has an open, slot-loading CD drive. You can insert a CD into this slot-loading drive on the iMac at any time.
Turn on your iMac.
Hold the CD so that the label is facing you, if you are in front of the monitor.
Insert the CD into the open slot on the right side of the iMac monitor.
Push the CD into the drive gently until you feel the drive start to pull the disc the rest of the way in.