hqin on "[Theme: Childishly Simple] how to add Yoast's breadcrumb"

hi,

i installed "Childishly Simple" and Yoast.

then i want add Yoat's breadcrumb in Childishly Simple's "header-container",but report function not exsits.any suggextion?

<div class="header-container">
	 <?php if ( function_exists('yoast_breadcrumb') ) {
yoast_breadcrumb('<p id="breadcrumbs">','</p>');
} ?>
</div>

Regards
hqin