Reading and writing comments takes place in the detail view. Below the information itself you can see existing comments as well as a form for new comments.
You can see the name and the photo (if available) of the author of each comment. For your own comments you have the possibility to edit or even delete the comment at any time, and you can link the comment to another object (see Linking objects).
As soon as you publish a comment you are automatically subscribed to this object. This means that you will get notifications about additional comments.