Seems most of them have not been enabled for users posts yet?
Although I got to say that you have a nice, very rich structure of sub-forums made up!
Weird, I registered a user account and it worked. Did you confirm your e-mail address yet? People with unconfirmed e-mail addresses can't do anything here.
Thanks for checking it, Leonie -- as I mentioned in the pleroma topic, it seems ok.
I could see write permissions in another tab, so a full refresh here solved it. Sorry for the false alarm. 😅