The first step is to check which version of VirtualBox you are running. Not all
support usb sharing. You want PUEL, not OSE. See this link:
https://help.ubuntu.com/community/VirtualBox

Next you need to have Guest Additions installed in the guest OS. Then there are
a few minor things to do such as unmounting the device you want from the host to
make it available in the guest. And then, if you were following the thread,
there are no guarantees that it will work. However, I have had good success and
so have others.