Set the captive portal Wi-Fi network's SSID and key at the Wireless
settings section.
Click on the Clone button at the MAC settings section (make sure
Advanced mode is enabled so the MAC settings section is visible).
Disable the openSPOT4's AP mode by holding the button for 3 seconds, or
by clicking the Disable Wi-Fi AP button at the top of the Network page.
The openSPOT4 will connect to the captive portal Wi-Fi network with your
phone/tablet/computer's already logged in MAC address.
Please keep in mind that MAC cloning may cause packet loss and the network
connection of both devices may get periodically interrupted.