Did you mount your DVD drive? Read "man mount" for more details. You need to figure out which device is your DVD (usually there's a /dev/dvd on fedora linked to the correct device) and then, when you have a DVD in the drive, do:
mount /dev/dvd /media/dvd
Make sure that the /media/dvd directory exists first!
You can set up automounter to mount media devices automatically (it would be done for you if you were using Fedora's Gnome or KDE GUI).