There are two important components at the unit. On one hand, the device wherewith the settings are made and reset. On the other hand, you have got a chart with a relation between number code of the control unit and assigned destination at the roll sign.
The two green buttons on the unit set the roll band a step back or respectively ahead. Always wait before advancing until the red light turns off. It signals that the roller belt moves now. The number indicates the currently set destination.
Please set "Flughafen" using the control unit.