R7000 to use WNR100 for connecting to security camera

> I flashed my R7000 w/ a VPN's access code, [...]

   "a VPN's access code"?  Whose what?  Do you mean that you loaded some
(unidentified) third-party firmware onto your R7000?

> [...] The trouble wIth that is, i can no longer get to the original
> settings/controls for the R7000. [...]

   If you replaced the Netgear firmware with some other firmware, then
the Netgear firmware is gone.  And complaints or questions about the
(unidentified) third-party firmware should probably be directed to the
(unidentified) third-party.

> [...] I can connect to it via my old N150 wireless router WNR1000

> because it operates at the slower speed appropriate to the camera. [...]

   "slower speed"?  Do you mean the 2.4GHz radio band?  What makes you
think that the R7000 doesn't use the 2.4GHz radio band (regardless of
whose firmware it's running)?

> The documentation for the R7000 is very poor wIth regard to speaking
> of "the router" and "the router" without giving me any indIcation of
> whIch is whIch. [...]

   Huh?  _Whose_/_which_ "The documentation for the R7000" are you
viewing?  It's documentation for a router.  How many R7000 routers have
you?

> [...] I remember settIng up the R7000 the fIrst tIme and having
> several passwords involved and never beIng sure whIch password was beIng
> demanded at whIch poInt of the setup procedure. [...]

   Do you remember reading the R7000 User Manual?  (I'd guess not.)

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual (at least).  Read.  Look for
"Types of logins".  Further reading might not hurt, either.  I'd expect
most of that to apply to your (unidentified) third-party firmware, too,
but you might want to consult the documentation for that, too, whatever
it might be.

> [...] Recently I discovered that "username" is a term applied to the
> router of all thIngs. [...]

   Look for "Types of logins" in the User Manusl.  Sometimes, reading
the documentation can actually be helpful.

> Are there clear instruction on how to run the older router out of the
> newer router? [...]

   It might help if you explained the actual problem which you are
trying to solve, preferably in terms which make sense to people other
than you.

> [...] When instructIons say "access poInt or bridge" does that mean
> [...]

   Did you look for those terms in the User Manual?

> [...] What is with tHe capital lEtteRs [...]

   No idea what you mean.