Access the Instructor's Page by clicking on the Person icon at the top right of Runestone. Make sure that you are logged in and that you are in your custom course (if not, use Change Course from the same menu). 

Here are some of the features available in the instructor dashboard: https://runestone.academy/runestone/books/published/instructorguide/InstructorInterface/InstructorInterface.html (if you're logged into Runestone, you may need to look at this link in incognito or add the instructor guide course in Person icon/Change course).

Runestone Setup tutorial and tips from PD: video and slides.