Yeah, we need to do a lot around messaging, to be clear - the wiki is in an early prototype and there are known bugs, etc. However if you want to try it out, install the repo (run initial_setup, then npm start server), then go to localhost:3000/wiki/ANYTHING. It will create a new wiki named ANYTHING?login=YOURNAME, and there you are.
Or go to https://icchilisrv3.epfl.ch/wiki/hn/Home?login=YOURNAME to test it immediately. (I added a tiny bit of content).