Wndr4500

> Wndr4500

   WNDR4500, WNDR4500v2, or WNDR4500v3?  Look for "Model" on the product
label.

> I want to change network passwords.

   Here's a radical concept which works for some people:

      https://en.wikipedia.org/wiki/RTFM

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual (at least).  Read.
Look for a topic like "Basic Wireless Settings".  Further reading might
not hurt, either.

> the www.router login.net did not help

   Neither did that information-free non-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.