this how-to should be sufficient:
http://forums.virtualbox.org/viewtopic.php?f=3&t=15868
short version:
Code:
mkdir /home/user/SharedFolder
under VirtualBox settings you set it as the shared folder.
boot the guest-system and create a mount point:
Code:
mkdir /media/sharedfolder
Code:
mount -t vboxsf SharedFolder /media/sharedfolder
(both names must differ)
i hope this is correct, i didnt do it for a while. just check the link.
greetings