1. From within your course click on "Communications" and then on "Classlist". 
  2. Click on "Add Participants" and then on "Add existing users".
  3. Search for the user to enroll in this course as an evaluator using the search box. 
  4. When you've located the user to add check the box to the left of the user's name.
  5. Click on the "Select a Role" drop-down menu and select "Evaluator". 
  6. Click on the "Enroll Selected Users" button at the bottom of the page.