Friends of HUE in Zigbee2MQTT with Functions

I need help to get a Friends of HUE Push Button running in Zigbee2MQTT. I have learnt it, but the button has no functions. Is there a way to get the button to work? I am using the Home Assistant with the Zigbee2MQTT addon and a Sonoff Zigbee 3.0 USB Dongle Plus.