I've been wondering for a bit, but what's the purpose of the warning system? Do people have permissions taken away when they reach 100%? What happens?
Depends on what you choose, but for example, if a user reaches 100%, you can either ban him, suspend his posting privileges or moderate all of his posts.
Go to the warning system, located on the configuration tab and add new warning type or add new warning levels.
Ah, now I see it. I was concentration on the Configuration --> Settings section, but now I see it. Thank you!