If a user completes an activity which has been enabled for ratings, they will be prompted to select a rating and enter comments to support that rating as further feedback.
The ratings window will appear upon closing a launched activity or, in the case of a document, when the status of the learning is changed to 'completed'.
When the ratings window is displayed, the user clicks on the number of stars which best represents their experience. 
It is a configurable setting as to whether it is mandatory to include a comment according to the number of stars they select. A red asterisk will indicate if it is mandatory.
Click on Submit.
The star rating will be displayed under the course name within the My Activities area when viewing completed activities.