Getting a simple chat to work?

OK, on a node-solid-server and two WebIDs, say me1 and me2, I log into me1 in a browser, and me2 in another browser and want to start a chat between these. I “friended” both in the relative profiles, and went to to see how it works. However, the instructions there are definitely missing a few (obvious to its writer) steps. What are the missing steps to get me1 and me2 chatting?