Forgot password and security questions C3700 WiFi

> Model: C3700|N600 Cable Gateway Docsis 3.0

   C3700[v1] or C3700v2?  Look for "Model" on the product label.

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 "Factory Default Settings".  Further reading might
not hurt, either.

> Wire connect a PC to the modem [...]

   It's a "Gateway" (modem+router).  Why would a wire connection be
needed?  I'd consult the User Manual.

> [...] and factory reset the modem using the back push pin button.
> [...]

   See the picture in the User Manual to help locate the Reset button.

You might follow the nearby instructions for that, too.

> [...] then log in to 192.168.1.1 or 192.168.0.1 [...]

   As the User Manual says, "192.168.0.1" (for a modem+router).