You can have multiple instructors in your course so that they get access to Gradebook, assignments, and course management. Adding instructors to your course does not give them access to your labs and projects.
To add them to your course, have them signup on app.autogradr.com/signup as an instructor. Once they have signed up, visit 'Manage Course' from the course dashboard and use their registered email to add them to the course.
Step by step instructions:
If you change your mind, you can withdraw them from your course as well.