Hi,
As you found out the official support forums for Razuna and all its products is at https://getsatisfaction.com/razuna. Furthermore, there is a video showing you how it work at https://www.razuna.org/whatisrazuna/razunawordpress.
The plugin work either with our hosted platform or with your self hosted Razuna installation. Depending on the installation type, you either simply enter your subdomain and user/password (for the shared platform) or additional information for the self hosted one.
The plugin is not broken, as we have over 1000 users and we just updated it. So, if you have any issue or ideas then we look forward to help or hear your feedback.
Thank you.