Connect via Wi-Fi to the device using SSID (network name) FLATMUASW-00XXXX (the XXXX is the serial number of the device. The whole text is written on the bottom of the device). The default Wi-Fi password is 'password'. Open a browser (such as Firefox, Google Chrome or Microsoft Edge) and navigate to 'http://10.10.10.10'. Then the Aurora website (FLARM Hub) is shown.
It is recommended to change the password under 'Configuration'->'Wi-Fi'. Make sure to write down the new password somewhere safe.