Since you have a /dev/cdrom, it should be sufficient to create an fstab entry for it. I'm not sure why there isn't one there already, however. My entry looks like the following:
/dev/cdrom /mnt/cdrom auto noauto,users,ro 0 0
The man pages for fstab and mount will tell you what each column means. Also, if you're using Fedora 6 as your previous threads suggest, you probably want to upgrade because that release has reached its "end of life", which means it's not longer supported (and won't receive updates).