It is already enable but i don't know how to connect my computer to see the USB stick
I'm on windows 7.
EDIT: I can read the USB stick on a mac with just typing "smb://IP adress"

But it helps me if I can do this on windows 7

EDIT 2: Works too on windows 7. I just type \\IPaddress on START>ACCESSORIES>RUN

P.S.: I think it have a size limitation with this router because i can't access my 320GB USB HDD
These attempts was successfull with my 8GB USB stick formatted on NTFS
Thank you for trying to help me!