Model C3700

With the app? 

https://kb.netgear.com/000059610/How-do-I-change-the-network-name-SSID-and-password-of-my-NETGEAR-router-using-the-Nighthawk-app

 

With the browser? 

https://kb.netgear.com/23438/How-do-I-change-the-router-password-or-network-name-SSID-on-my-older-NETGEAR-Smart-Wizard-router

 

There's a support site with access to manuals, firmware, install guides, etc.
Go to https://www.netgear.com/support/
Type in your model number and from there it'll take you to the above.
Its a great resource to start with.