Add bread crumbs (with the yoast plugin)

Enable breadcrumbs in Yoast:

Search appearance > breadcrumbs

Then add this somewhere in your template:

<?php
    if ( $post->post_parent ) { // optional only add breadcrumbs if the page is a child-page
      if ( function_exists('yoast_breadcrumb') ) {
        yoast_breadcrumb( '<p id="breadcrumbs">','</p>' );
      }
    }
  ?>
<?php