Welcome to AFC, Max! We're, uh, a little empty since there hasn't been any new updates in the Artemis Fowl universe. Basically, every forum is grouped by topic. There's a few Artemis Fowl-related forums for Books, the Movie, Eoin Colfer, and Fan Stuff. Then there's the Haven City forums for just general, non-Artemis Fowl topics. The Square has a few random, ice-breaker things, and City Central is for news stuff. The rest is pretty self-explanatory. Just make sure to stay on topic in wherever you're posting.
If you have any other questions, just shoot me a PM (private message) or ask around. Again, we're pretty empty here, so there might not be too many people replying.