Need help :) Drupal 7 How to add user title or description on the user's comment part?

Hello, everybody! I installed the new Drupal 7. At the moment, it runs in the default settings. I posted a node of Article content type, then I did a comment to the node.

For now, you can see it in the picture 1.jpg.
1.jpg:
http://i47.tinypic.com/5kkgo0.jpg

But I want it to be like 2.jpg.
http://i48.tinypic.com/2lu5ai8.jpg

In other words, I want to add a title or description to some users. The title or description can only be edited and controlled by me, the administrator. I searched some at Google and Drupal official site and still don't know how to implement that. Could you tell me how to add that?

Thanks! Appreciate for any answers!