Thread:HookshotHotshot/@comment-24993958-20160309155647/@comment-24993958-20160309162958

Content boxes are added automatically if there is a large enough number of headings; you make a heading by changing the text into another format.

Look up your edit bar when you select a piece of text and look for a dropdown that initially says Paragraph and change it to something else. Once you have enough, the content box is generated automatically.