Can’t access R7900P with preset network name and password

> Can't access R7900P with preset network name and password

   Could you ever?

   "Can't" 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.

   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" and "Factory Settings".  Further reading might not
hurt, either.  Something like "Basic WiFi Network Settings" or
"Troubleshoot", for example.

   If you can't get connected wirelessly, then an Ethernet connection
might work better.