did you read the docs? i have wine installed but im fairly sure they are similar. check your config file for the proper path to the cdrom mount point. should be something like :
[Drive x] <------ x = your cd-rom drive letter under dos.
"Path" = /path/to/your/cdrom/mount/point <--- normaly /mnt/cdrrom
"Type" = "cdrom"
"Label" = "CD-Rom"
"Filesystem" = "win95"
; make sure that device is correct and has proper permissions !
"Device" = "/dev/cdrom"
check it out and make appropreate changes as needed.