There should be an "edit" button on the original post that you can use. In response to your original question, it kind of depends on the directory. Generic categories might include "writing, creative writing, fiction", etc. Neat concept.
That's difficult to categorize. You could put it under online games, though when you're thinking online games, you're thinking interactive flash games.
I think this should go more under art, as we are all making some kind of art till the end what do you think?
Yes you are right vit4ek. Story writing is also one kind of art so you can do submission in art category.