How do I change the WiFi password on my CAX80?
Log in to the modem router by entering routerlogin.net or 192.168.1.1 in a web browser, select Wireless, and in the Password (Network Key) field, enter a new password between 8 and 63 characters. Click the Apply button to save your settings. Note that the WiFi password is different from the admin password used to log in to the router.
From the official Netgear CAX80 Modem Router manual, page 51
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