Even if you consider yourself to be a veteran Notable user, a quick spin through the Frequently Asked Questions
could benefit you. It can give you a good sense of how Notable is set up and how to get the best use out of it. The general FAQ walks you through the suggested Notable workflow: Capture, Annotate, Share, Create Sets, Add Workspaces.
Are you setting up all your users first, then making captures and putting them into workspaces, then going back and trying to annotate things? You may be putting the cart before the horse! Try getting back to basics.
Once you feel comfortable with the basics, you can check out the other FAQ categories for more detailed info about complex topics like upgrading, downgrading, adjusting permissions and setting up workspaces.