If you need to make a change to your course information (institution, title, course number, section number, time zone, etc.), hover your mouse over the course row in your Dashboard and click Edit at the far right. If there are no students enrolled in your course, you can edit all of the course information fields.
Once students are enrolled in your course, you will be unable to change the school associated with that specific course. If you need to change the school association after students have enrolled in your course, you will need to create a new course, and then ask your students to switch into the new course (see the help article A student registered in the wrong course. How can I switch them to the correct one?).