Any file in the Project Kaiser may have comments. Users with necessary access level, can leave comments. Moderators can also edit and delete messages.
To show comments to selected file choose "Comments" tab on the file toolbar:
You can view and manage comments.
File types "Issue" and "Requirement" display the "Comments" block on the main tab.
From version 11.0 there is button "Add" near the hidden "Comments" block:
In "Comments" Block files such "Issue" and "Requirement" appears task history.