You can add an administrator, but you cannot edit their settings or remove them from the course.
Video Tutorial: Add an Existing User to a Course
Video walkthrough
Video Tutorial: Add an Existing User to a Course
Watch this tutorial without leaving the article.
Select a course in Spark.
Click User Management.
Click Existing Users +.
Click the All Roles dropdown menu and select Administrators.
In the Search field, enter the first few letters of the administrator's name, username, or email address.
A list of matching administrators displays.
Scroll to the administrator you want and click Add.
The administrator is added to your course.