webserver auth setup issues

Just installed Drupal for the first time today. It's on my own Linux/Apache server, so I have access to all config files. I'm trying to get the webserver_auth module working. I have it installed. I have it enabled.

I'm using Drupal only for blogs on a college campus. I want the world to be able to browse the site and look at any and all blogs. I want a user here on campus (students/faculty/staff) to be able to click some kind of "login" link that would allow them to login via Apache's HTTP authentication. Once logged in, I want them to be able to edit their own blog, or create one if they don't already have one.

I can't get Drupal to recognize the logged in user id. I suspect it's cuz I have something setup incorrectly. When I go to the Drupal URL, the browser prompts me for login (which is not what I want, cuz I want the world to be able to browse around and read without logging in). I only want the login prompt to happen if the user wants to edit/maintain their blog.

So, what directory/URL in Drupal should require the authentication?