MQTT: lock & unlock @ ioBroker

I tried yesterday, I tried today…
How do I get the SL3p via MQTT to lock and unlock?
I’ve read the “20220223 MQTT API 1.4-1.pdf”.

I’ve set the “allow locking” in the App

What else do I have to do to get the SL3p to exept lock & unlock command and on which register?