Openwrt sharing a files

[politech]

Hi,
i want to share files from win7 host to openwrt guest. But i can't instal GuestAdditions-cous when i go devies/install guest additions on my openwrt in mnt folder i got nothing and i dont know how to do that.I also tried mount -t vboxsf sharename mountpoint but it gives me "No such device". I configrated bridge connection on it so i got net.

[politech]

http://imageshack.us/f/268/screensa.png/

http://imageshack.us/f/851/screen2z.jpg/

What am i doing wrong?
Network on virtual box-bridge