I do not use the CoffeeCup editor, so I downloaded the free version. When creating a test page, it seems very straightforward as an editor. For your question on where ad code should be placed, it really depends on how you want to display it. Generally, you do need to ensure the code is placed within the Body section of the page for it to display.
I do not know what your particular page looks like so I am unable to give anything more specific.
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