This page has a link to Canvas documentation
The following contains information on the roles in Canvas and the default privileges associated with each: What user roles and permissions are available in Canvas?
Roles cannot be changed by teachers once a course has been concluded. If you need to change someone's role in a concluded course, please submit a ticket to the Technology Services Help Desk at email@example.com.
Note: The role of "Grader" is a custom role for our campus instance of Canvas, and its privileges will not be found on the link above. For more information about roles and permissions in the university's instance of Canvas, see Canvas@Illinois Course Role Permissions