As warned we've had to migrate the topas UNB forum to new hardware and new software. We lost three or four posts from early October in the process - please repost them if they were important. I think that peoples' accounts have migrated over succesfully, but there is a chance you will need to reregister.
Hopefully you'll like the new flarum interface. It should be pretty self explanatory. If you need help try: https://docs.flarum.org/
Apologies that the migration happened a bit more abrupt then originally planned.
John