Hi David, and welcome!
Here's the basic scoop on organization through Notable: Any time you share a post with someone, they will be prompted to create their own login for your Notable Account (if they don't already have one). You can create different workspaces, sets, and permissions within the account to give different users visibility of different things. Check out the Permissions & Workspaces section of our F.A.Q., and our Tour:
http://www.notableapp.com/tour/share-control-feedback
Regarding code - Notable will capture the code from a Webpage, and it can be reviewed and annotated under the "Code" view on the post. If you have code from another source you wanted to show, you could save a screenshot to your computer and then upload it to Notable. Does that answer your question?
Feel free to contact us directly at support@notableapp.com with more questions or feedback.
Look forward to hearing from you!
-Elizabeth Bouinatchova