Nighthawk R7900P X6S setup issues

> [...] each time I get to the point where it says it's configured [...]

   Does that mean that you're using its setup "Smart Wizard"?  Some of
the non-psychics in your audience might not be able to see the steps,
including your responses.

> It shows my WiFi is connected; [...]

   "It"?  "shows"?

> [...] I cannot log into my Nighthawk app or www.routerlogin.net. [...]

   I'd avoid any Netgear-supplied app, and stick with a web browser, but
"cannot" is not a useful problem description.  It does not say what you
did.  It does not say what happened when you did it.  As usual, showing
actual actions (commands) with their actual results (error messages, LED
indicators, ...) can be more helpful than vague descriptions or
interpretations.

> [...] I can't access my email, it won't let my husband connect his
> x-box to the WiFi and some internet sites won't connect.

   Well duh.  If the router's not configured/working properly, then any
Internet access might be difficult.

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual (at least).  Read.  Look for
the LED descriptions and "Troubleshoot"?

> [...] is there a way to designate the guest WiFi as the 2.4 ghz and
> the main WiFi as the 5.0 ghz so we can switch between the two or use one
> or the other for different devices?

   In the User Manual, look for "Manage the Basic WiFi Network Settings"
(and, perhaps, "Manage the Basic WiFi Settings and WiFi Security of the
Guest Network").  You can assign a different SSID to the 2.4GHz radio
and the 5GHz radio without dragging "Guest Network" into the discussion.

> [...] The "tone" of the help on this forum is quite condescending.
> [...]

   It can be hard not to sound "condescending" when asking for the most
basic information.

> [...] I'm not an idiot, I have a degree in engineering [...]

   And yet, your attempt to ask a technical question was this lame.

   Vast expertise and experience are not required to provide a useful
description of what you did or what happened when you did it.  Nor are
they substitutes for relevant information.

> [...] I understand that there may be a LOT of tedious and repetitive
> questions, [...]

   "tedious and repetitive questions" are not the problem.  People who
can't be bothered to consult the readily available documentation, whose
problem "descriptions" assume that the reader was present during the
user's activity, and who then get all huffy when asked for basic
information whose importance should have been obvious from the beginning
-- _those_ are problems.