@baris Forgot to rebuild and restart...
It's working now !!
I've successfully set up my first nodeBB Forum, and it looks really good. But there's one big problem with it, and I didn't find any solutions in the internet yet: I want to have something like a Ranking-System, so I could configure, that if someone has posted more than 50 times, he gets a specific rank. If he gets more than 100, he gets another one. The Ranks should have different permissions, and i should be able to configure, that you can't get one rank (like "mod" or "admin" or "supporter"), only if I give it to you.
It would be really good, if somebody out there would know a plugin which does this work, or knows a solution without a plugin.
Thanks in advance,
Probably it isn't what you expected to get as an answer