it is on the the sticker in the battery compartment and has nothing to do with the wifi when the mav is being flown with the controller,the only time you need it is if you planned to fly with your phone, the only problem is that it severely limits the mavs normal range and height and is really a back up if the controller is not available,and of course you will have to move the switch to the wifi position under the cover where the memory card goes
That's a legitimate question as I myself never knew what my wifi password is but I never really understood what the whole point of the wifi on the Mavic.I had a hunch, but now I know.... thanks