Switch/power your luminaire on, and the Casambi app should find it automatically.
If you haven’t used the app before, and there are no networks, the app will automatically create a new network when taking a luminaire into use. If there are available networks it is possible to select which network you want to add the luminaire to.
It is also possible to pair a luminaire to a network from the "Nearby devices" screen. The Nearby devices screen is found under the ‘More’ tab in the app or by selecting Nearby devices from the main page.