[Zope] Security questions

Hi I have some kind of problems to understand how Zope's security rules If I have these distribution: root Blogs Blog1 Blog2 Blog3 where Blogs: Folder Blog1, 2, 3: Coreblog product How can I configure the security to have 3 users (User1, User2, User3) who can log on ZMI to manage their weblogs? I suppose (but don't work properly for me) I need to create a user folder on Blogs folder and create 3 users on it, isn't it? Thanks!