Start a root console.
Code:
kate /etc/fstab
For each fat partition you will find a line like
Code:
# /dev/hda3 /mnt/hda3 vfat  noauto,... 0 0
Remove the comment char # and replace noauto by auto.
After rebooting your partitions are mounted. You can find each partition as subdirectory of /mnt, e.g. /mnt/hda3 is the mountpoint for /dev/hda3.

If you want to have shortcuts on your desktop: right mouse click on your desktop, "New - Shortcut to HD" [strings could be other, I know the German version only)
I hope, this helps a little bit.
Hamatoma