What happens when you log in?

Level of access
Once you have logged in you can do various things depending on your access level. The higher levels can do everything the levels below can do.
1) Registered: View restricted parts of the site.
2) Author: Add articles but nobody can see them until they have been read and published by the administrator. Once published an author can edit his/her own articles but nobody else's.
3) Editor: Same as author but in addition can edit any article.
4) Publisher: Same as author and editor and in addition can publish (make visible to everyone) other peoples' articles.