Whew. Well, that was a colossal waste of time. Apparently, if I save a bookmark to their site, I'm violating the "no linking" clause in their agreement. Anyway, I did attempt to "register" whereupon it told me "Someone already has that serial number registered!" I guess that's gonna turn out to be me.
Anyway, that indicates that you want the number on the sticker, like Randy says, the 100xxx number. Then I betcha it tells you you're already in there.
Edit: The site appears to be useless...everything is either "Coming soon" or "Sign up now!" Why they want me to sign up when I'm already logged in, I can't figure... Well, never mind. There may be a way but I'm done for now.
P.S. I doubt Blink needs more than a fraction of all those disclaimers in their agreement, but I think Nissan's Customer Service might want to check them out