HOWTO: sync nextcloud instance with desktop client

I cannot find a tutorial anywhere on how to sync carnet nextcloud instance with my desktop client.

I have installed carnet on my nextcloud server but I cannot figure out where to get this information in the following window.

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It looks like it is asking you for the URL to your NextCloud server and the NextCloud username and password.

If you keep your notes in a particular directory on the server, you may need to fill in the path field.

I wish I had a window like that. I cannot find a way to link my Carnet app to my own Nextcloud server.
Any ideas?

I want to give this post a push. I miss the information what to put in the address field. I tried with my normal server domain e.g. , but this does not seem to work.
Thanks for any input on this.