When a KPI has a comment the system will display the comments icon, and the comment can be viewed by hovering over the icon as highlighted below:

To add/edit a comment you will need to click on the KPI card to view the Chart, the system provides you with a comments field that is hidden by default, it is visible when you click on the comments icon as highlighted below:

You can add your comment on the above and it will be automatically saved against the current RAR, these comments are also available on the RAR email and downloads.

You can remove the comment by deleting all the characters captured.