Navigate to the My Courses screen in your LessonFlyer admin panel. Then click on the name of your course or click on the course outline icon pointed out in the screenshot below.
Both of these links will take you to the Curriculum & Content screen where you can reorder the sections and lessons in your course outline.
You can reorder both sections and lessons from a course's Curriculum & Content screen.
Hover your mouse over the 'grip' icon on the far right side of a section or lesson. Then click and drag it to the desired position. When dropped in a new position the order will automatically update and save.
Note: You can also drag lessons between sections (from within one section and into another).