OK, even when I go to the global_priv table information, the link you gave me doesn't seem to tell me how to add users and passwords. For now, I'm using root with no password, but I'd really like not to.
Also, is there any chance this could be moved to the English forum, please? I don't speak German, so I won't be able to answer any replies without Google Translate.
Edit: Oh wait, it appears there is no English-only forum for Apache. Never mind then.