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To add a topic to the course scroll all the way to the bottom of the course (sections are automatically added to the bottom of the course but can be moved around once they are created) and hit the Add section button.
Many of the functions of your course can be found under Course Management. You have the ability to change student groups, enrolled users, enrollment keys, grades, backup your course, and more. There is more detailed information on how to do some of these tasks in the other pages in this sections of Confluence.