Installing Remotec ZRC-90 problem -> stop HA?

I’m migrating from Homey to HA.
In Homey I do use a Remotec ZRC-90.

I try to install the Remotec at HA.
It is paired in the system and only recognized as zwave device (no functionality)
I found the next link with instructions how to install:

I need to do changes in the zwcfg file at the node number of the remotec device.
I did.
I saved the file and restarted the HA, after restart the old configuration is back again?

It says before changing the file stop HA first. I don’t know how to stop/rstart HA?

What to do?