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By either clicking on a module heading or the drop-down arrow next to it [1], the contents of the module will open with additional headings appearing beneath it [2]
You can then use the scroll bar on the right-hand side to move up and down through the module headings.
Clicking on a particular heading [3] will populate the content in the display window to the right of the menu [4]
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Click through the above steps to learn how to use these features.