As soon as the LTI add-on has been installed, any teacher you add to your course in the Learning Management System will have access to your bulbs, student grades, and editing capabilities. The co-instructor functionality allows for multiple instructors/TAs to manage the same course. The first person to launch playposit from the course becomes the primary instructor. Anyone else with a non-student role (co-instructor, TA, etc.) launching the course after that becomes the secondary instructor acting on behalf of the primary instructor. In other words, secondary instructors are always authenticated into the primary instructor's account.
If you would like to designate another teacher as the owner of the course, simply reach out to firstname.lastname@example.org with the course name and the teacher account you would like designated as the primary owner.