2.2 Connect to the Internet via an existing Wi-Fi by Repeater
Using Repeater means connecting the router to another existing wireless
network, e.g. when you are using free Wi-Fi in a hotel or cafe.
It works in WISP (Wireless Internet Service Provider) mode by default,
which means that the router will create its own subnet and act as a firewall
to protect you from the public network.
On the left side of web Admin Panel -> INTERNET, Repeater sector.
Basic steps
Click Connect in the image above.