All users can communicate with each other by using the Comments feature.
In the Book Builder select the content you would like to edit.
Select the text you want to comment on. This makes a Comment bubble appear to the right.
Select the Comment bubble to open a writing area.
Type in your text and hit the return key or click Post to save your comment.
Important, if you click outside the comment window before hitting return or clicking Post your comment will be discarded.
To reply to a Comment, click on the Comment to reveal a new writing area. Click Post to save your reply.
If you would like to comment on text that you will remove, post the comment first and then delete. Note: you will need to be in Suggesting mode.