Forgot password and security questions C3700 WiFi

Wire connect a PC to the modem and factory reset the modem using the back push pin button. Hold it in for 15 seconds then let go. Wait for the modem to come to ready, then log in to 192.168.1.1 or 192.168.0.1 using a web browser and walk thru the setup wizard. This time write down all important information for safe keeping later on.

> 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).