Plug the USB stick in the USB slot on the front of the computer then mount your USB stick by typing in an xterm:
% priv usb mount
To access all files on your USB stick, type in an xterm:
% cd /mnt/usb/N
where N is the number that was displayed when you mounted the USB stick.
To remove your USB stick, type in an xterm:
% priv usb unmount
Now you can remove your USB stick safely. You are advised to unmount the USB stick before remove it otherwise the USB file allocation table (FAT) file may be corrupted, you may end up with lost all the files that you save onto the stick.