CAN'T OPEN CD-ROM DISC DRIVE

Hello,
I received an answer to my question - that there is a hole under the disc drive that if I insert a pin the cd-rom drive will open. Maybe I didn't explain correctly. This is my first pc and I am very new at using it. My pc has 2 pieces, the monitor and the other piece is where my cd-rom drive is. I think it is an old pc. There is no hole under the cd-rom drive where I press the button to eject the cd. Do you have any other suggestions on how I can open this? Thank you.
Bean