User roles are set when adding or editing a user. By default, new users are added to the program with the role of Evaluator, but that can easily be changed when necessary by a user with the appropriate permissions in the program.
This article explains how to edit a user's role or delete a user.
Click "Users & Groups" in the left navigation menu
Search for the user in the list of users, and click the edit pencil to the right
This opens the "Edit User" window where you can make changes as necessary
To delete the user, click the "Options" button in the lower right corner and select "Delete User"