You will have to download VZ Access Manager here:
Also be aware that to tether using your bb to a computer through VZ will cost you $30 a month extra on top of your bb data plan. If you decide to do this you need to contact Customer Service so they can add this feature on your plan. There is a 5 gig limit per month when tethering.
P.S. You need to use your BB usb cable to connect to the computer/laptop when tethering.
Also take a look at this: