Edit the following in index.main.php

if( $disp == 'single' )
{
	// -------- "Post bottom" CONTAINER EMBEDDED HERE ---------						
	skin_container( NT_('Post bottom'), array(
			'block_start'	=>	'<div class="PostBottom">',
			'block_end'		=>	'</div>',
		) );
	// ----------------- END OF "Post bottom" -----------------
}

Genius! Works perfectly. Thank you!