The Course Editor screen is divided into 4 main sections: the 2 sections on the top part of the screen focus on the course you are working with, while the 2 sections on the bottom focus on the various items within that course.
At the top of the Course Editor, toward the left is the Course Information panel, which displays the ID and name of the course you are currently working with. Beneath the Course Information panel is the Item Information panel; it provides information about the various components contained in the course, and provides access to the various actions you can perform on those items using the accompanying Action icons. To verify the action associated with any of the icons, click the small "i" to access the Actions legend.
For both Information panels there are corresponding Control Panels that appear on the right-hand side of the screen. By clicking the buttons contained in these panels, you will be able to modify and manage the particular course you are viewing, along with the items it contains. For more information related to any of the options contained in either the Course Control Panel or the Item Control Panel, click the option, and then access the context help related specifically to that function by clicking the question mark icon on that particular page.