I just clicked on a note icon beside a passage and it opened the note, that's OK.
But in looking at what I call the side-bar which lists other notes, there must be 50-100 notes with PBB-followed by many numbers. They all have the padlock icon and when I click on one of them I am told I do not have a license to view this resource.
I've not figured notes out as yet, but this is a real bump in the road.
I'm guessing PBB stands for Personal Book Builder, if so, where did that come from?