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1. copy /skins/_html_footer.inc.php file into your skin e.g. /skins/mysqkin/_html_footer.inc.php
2. ... then edit it :)

is it the one you mean?

<?php
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/**
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* This is the HTML footer include template.
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*
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* For a quick explanation of b2evo 2.0 skins, please start here:
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* {@link http://manual.b2evolution.net/Skins_2.0}
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*
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* This is meant to be included in a page template.
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* Note: This is also included in the popup: do not include site navigation!
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*
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* @package evoskins
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*/
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if( !defined('EVO_MAIN_INIT') ) die( 'Please, do not access this page directly.' );
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// Trigger plugin event, which could be used e.g. by a google_analytics plugin to add the javascript snippet here:
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$Plugins->trigger_event('SkinEndHtmlBody');
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?>
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<!-- End of skin_wrapper -->
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</div>
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</body>
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</html>

Yes