How do I change the WiFi password on my AC1200 extender?
Log in to the extender at www.mywifiext.net with username 'admin' and your current password. Select Maintenance > Set Password, enter your old password, type your new password twice, and click Apply. NETGEAR strongly recommends setting a more secure password after initial setup.
From the official Netgear Extender AC1200 manual, page 38
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