Directory confusion.

I'm a little confused about this one.

Is it an absolute requirement to activate throughout a network? Or can individual blogs add it?

I see all the admin options but I'm struggling to see the front end (tried on two blogs), when you activate the plugin is it suppose to create any pages?

If I ad listing an click on view listing I can see that, but not the directory categories as displayed in your plugin page (I attached the image to show how I imagined it would show off the bat)

So is the directory page create automatically or is there something I should be doing extra?