I should add that it is just as easy to post the stories in blog format. On your end the posting is the same. Create a topic thread with the story title, put your story in the post and press send. If your story is longer than the word limit it will tell you. Simply split your story as you would in a forum thread into multiple posts. Create a second thread, give it the story title with Part II added to that title. Post the second part in that topic thread.
Even if you used the forum format you would still need to separate the story into more than one post, and the blog format looks so much nicer.