Set Value via ADS or how to use a service

Hello everybody,
I am really new to HASS and I am planning of using it in my house to controle my PLC via ADS.

Right now I was able to set a bool via the switch and read a bool. I also can read a value (int). This really works very smooth :smile:

I am only in trouble of setting a value. I used the documentation from the web, but I dont understand how to use a serviceā€¦

For all the other components to communicate I just added the config to the configuration.yaml.
But for this it is not workingā€¦

Can somebody explain to me how to use the service in an button to set a value?

Thanks for your help!