Each Zen Cart "page" needs to have a folder in the /includes/modules/pages folder that carries its name.
If you also have a file named /includes/templates/YOUR_TEMPLATE/templates/tpl_about_us_default.php (either in the YOUR_TEMPLATE or template_default) folder, then it sounds like all you're missing is the filename definition (normally found in the /includes/extra_datafiles folder).
There "should" be a file named something like /incudes/extra_datafiles/about_us_filename.php; if it's not present, then create it with the following content:
Code:
define ('FILENAME_ABOUT_US', 'about_us');
At that point, the code you posted in your original posting should magically start working.
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