Short description of chapters and bookmarks
Right click in the grey area with the diamonds in the picture and you a popup menu will appear. The diamonds are bookmarks I’ve already added.
There you can either add a chapter or a bookmark:
If you select a bookmark then you can name it in the popup after right clicking on the diamond:
If you select add chapter you get a first placeholder for the new chapter:
Click on the next bookmark or just move to somewhere in the video using the progress bar above the bookmarks:
Right click on the green chapter placeholder and select set size. You can also change color and set/rename the chapter in the same popup menu.
The result should be that the chapter is extended to where you are in the video right now:
You can open up a chapter window if you want using the Chapters option in the View menu:
The chapters window opens up. Here you can also rename the chapter by clicking in the large blue box. The little blue vertical bar to the far right will delete the chapter if you click it. If you click the colored box you can change the color of the chapter.
A final word of caution. Managing bookmarks/chapters isn’t part of undo/redo history so changes can’t be undone if you make a mistake.
Hope this helps.