How do I add another level to my table of contents?

You can add one additional level to your table of contents. In order to enable this setting: 

 

1. Go to Appearance > Theme Options
2. On the Global Options tab, find the Two-Level TOC setting
3. Select "Enable two-level table of contents (displays headings under chapter titles)" 
4. Click Save Changes

Now, any text in your body that has been tagged with a Heading Style 1 will display underneath the chapter title in your table of contents.