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Forum Discussion
R8000P — Nighthawk X6S AC4000 Tri Band WiFi Router
How do I change my wifi passwords?
https://kb.netgear.com/23439/How-do-I-change-my-NETGEAR-router-s-WiFi-password-or-network-name-SSID
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.