Thanks for the tips. I did setup bookmarks (2 in this particular instance), then exported to DVD. I used the menu as supplied. There is an option on it to customize the image on the menu, and an option to shift the text left, center, or right. There is nothing obvious to me about where to position the buttons for the bookmarks to appear. It'd be nice to have them on the DVD menu so you could start in a chapter/bookmark.
When I play the exported DVD, it start on the menu screen. The only option is to play the DVD. There is no indication that chapters exist on the DVD. Why name the chapters/bookmarks if the don't appear on the menu?