How do I change the WiFi network name (SSID) on my AC750 Range Extender?
Log in to the extender by opening a web browser and entering www.mywifiext.net or your extender's IP address. Enter your admin email and password, then navigate to Settings > Wireless. In the Network Name (SSID) fields, type your desired network names and click the SAVE button. Your settings will be saved immediately.
From the official Netgear Ac750 Range Extender manual, page 18
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