Hi, I assume, that you are trying the only demo at http://demo.ezpublish.no/forum
You can log in with the admin user ("admin", PW: "publish") and try to use the forum functions (create new threads and replies).
You should be able to create new users and use them, but note, that the complete demo website including it's database (thus including the users) are reset every 3 hours, i think, so your new user and threads and replies will get deleted periodically. Maybe this happened with your user ;)
