How do I add a chapter to an existing story?
Before adding a chapter make sure you're not submitting more content per day than allowed:
Authors in the moderation queue: When submitting a new story to the site, do NOT post more than the prologue and the first chapter. Additionally, while you remain in the moderation queue, do not post more than one new chapter or new story until the existing chapter/story is approved. The moderation queue is typically reviewed once per day.