For those looking to setup Asus router in AP mode, begin by linking the router to your main modem using an Ethernet cable. Turn on the device and open a browser on your connected phone or computer. Enter “router.asus.com” to access the login page, then sign in with your credentials. Go to the Operation Mode section and choose Access Point (AP) Mode. Complete the guided steps to enable smoother and wider WiFi coverage throughout your home.
https://asuslog.com/asus-router-setup/