User blog comment:Jisu Lee/Jisu's Random Rant 1:community articles/@comment-3251190-20110221031345/@comment-844113-20110221051404

You click the "Add a Page" button and add the prefix "Category:" to the title.

Therefore, "Category:Che's Articles" works. "Category: Che's Articles" does not. There can't be a space there. See what I mean?