Comments in the system can be edited, but only 60 seconds after their creation and only by the comment owner.
Reminder: Comments are always on task level.
To edit a comment:
1. Write a new comment or reply to an existing one.
2. Select Edit in the top right corner of your comment.
3. Edit your comment in the Edit Comment dialog box and select Add Comment.
Note: Every time you edit a comment the 60-second timer will reset.
In the same fashion, to delete a comment, select Delete in the upper right corner during the 60-second editing interval.