"define_main_page" is only intended to display a bit of content, mainly HTML, to the top center section on the home page.
There's no "attaching" of content to a define page. A define-page shows its content on other pages, not the other way around.
Displaying the categories menu in the sidebar of your template is accomplished by turning on the categories sidebox for the left-column, via Admin->Tools->Layout Boxes Controller.
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