Only Office Setup

When launching onlyoffice for the first time, I see that it says not to use the example, how would i go about setting up onlyoffice properly?

I don’t know if it is meant to be a standalone application. I think its meant to be used with Nextcloud. I just installed it on my local NextCloud, took a little digging around but I managed to get it up and running.

How can you enable it?