You can add comments from the viewer to videos, Live Events, and sections of a book at the title, chapter, page, or paragraph level. You can also respond to existing comments on content by creating a comment on a comment.
To add a comment via the viewer
Launch content in the viewer.
Click . The Add a comment to this section dialog box displays.
Select a word in a paragraph in the section to attach the comment to. If you do not select a word, the comment is made at the top of the section by default.
Enter your comment in the field and click Add.
The comment icon changes to to denote that there is a comment has been added.
Click to close the notes window and return to the viewer.