The instructor dashboard is divided in two columns. The main column on the left displays a listing of all the courses you own as Instructor, and allows you to view, edit or view reports for any of them. Note that when you add a course you become its owner, and you can still manage a course you have created even if you stop being an Instructor for it. The right column shows you your profile picture, a calendar with upcoming items highlighted, and a Tools palette.
The Tools palette contains links to add your Group Key, see the full Course Catalog, manage Discussions and view Courses. If you have plugins installed, this is the place they install icons that let you configure them.