Q: how do i get my disk out of my iMac desktop

i have a imac desktop. have never used the dvd player except for today i placed in a new printer intaller disk. it made a lot of noise and then a screen popped up telling me that the software was not compatible. so i clicked "ok" and then nothing. the disk is still inside my desktop and for the life of me i can't find a remote control or anything else to eject the disk. please help.