1. Log in, and select "Documents."
2. Upload your story; it should be an completely different file from your earlier chapters.
3. Next, select "Stories" on the sidebar (it's right under "Documents"); pick "List Stories" at the top.
4. Find the story you want to add a chapter to, and click "Edit."
5. Now go to "Content/Chapter" near the top of the page.
6. You should see a thingie called "Add Chapters" around the middle of the page. Type in the name of your chapter (it can just be "Chapter 2" if you want), and select the document you're using from the drop-down menu.
7. Click "Add", and it should work!
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