How to make "Next annotation", "Previous annotation" buttons work in CoIDE CooCox?

Question

IDE

Please tell me whether it is possible to use indexed or at least ordinary markers in CooCox when writing and editing programs, which can be used to mark several lines, and then quickly move between them. It seems that they have an option for this, but I can’t figure out how to work with it, which makes debugging and writing code very difficult.

I tried to put different checkboxes in the displayed list, but I could not achieve anything.