how do i mount a cd in runlevel 3

If this doesn't work try looking in the /etc/fstab file to see where it should be mounted.

$ cat /etc/fstab
# This file is edited by fstab-sync - see 'man fstab-sync' for details
...
/dev/hda                /media/cdrom            auto    pamconsole,fscontext=system_u:object_r:removable_t,exec,noauto,managed 0 0
 
 
$ mount /media/cdrom

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You can find out what device you CD-ROM is on like this: -

$ dmesg | grep CD-ROM

hda: ATAPI 24X CD-ROM drive, 128kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20

-- So the cdrom is on /dev/hda

OR

find /proc/ide -name media -exec cat {} \; -exec echo {} \;

cdrom
/proc/ide/ide0/hda/media

-- So the cdrom is on /dev/hda

Further into: -

http://www.faqs.org/docs/Linux-HOWTO/CDROM-HOWTO.html#AEN980