This GIF will help you add chapter markers to your content.
1. Use the waveform viewer to pinpoint where you would like the chapter to begin. The bottom waveform shows the entire file, the top shows a "zoomed in" view of your selection. (If no waveform is loading, click "W")
2. Click "+" to add a new chapter.
3. Edit the name, description and other metadata by clicking on the fields.