Please follow these steps to connect the monitor to WiFi:
Power on the monitor
Find a WiFi hotspot called "airgradient-xxxxx" and connect to it. Use the password "cleanair"
On Android 11 or 12, please select "Manage router" if prompted
On some Android version you might need to tap "Tap here to sign in to network"
Wait for the WiFi Manager screen appearing. In case the WiFi manager does not appear, open 192.168.4.1 on your browser
Press "Scan for Network"
Select the WiFi network or enter it manually in case it is hidden
Enter the password and click "connect"
Successful connection is indicated with green LEDs.
Please note that you have only around 180 seconds to go through above process before a timeout happens. In that case, restart the process by re-booting the monitor