Currently to join or create room one has to use same dialog - "Creat or join a room" button in the Rooms browser. Which is confusing. Especially when you have to join a room with a password. It is not clear when you have to specify the password. It seems that you only have to do this on the last dialog. But you are presented with the password field (and topic) on the first dialog, then on the second one (when you have to specify a nickname (and a password)).