How do I log in to the AC1900 Range Extender's web interface?

From a device connected to your extender network, open a web browser and enter http://mywifiext.local (or http://mywifiext for Windows if One WiFi Name is enabled). On the login page, enter your admin email address and password. If you have One WiFi Name enabled on Android, use http://<extender's IP address> instead, which you can find by logging into your router.