Copying the schedule you created into the semester is the final step in the Master Scheduler process. Once you run Step 6, all of the courses and enrollments from your master schedule will be copied into the semester it is linked to.
Simply click on the "Copy Schedule Into Semester" button to copy your schedule into the semester:
WARNING: Each time you run this step new sections will be created. This means that the system will delete any sections that were previously added to the semester when running Step 6 including ALL DATA associated with those sections (including gradebook and attendance)