how to show child pages?

Solved… Found this page: https://codex.www.ads-software.com/Template_Tags/wp_list_pages

Used this one:

<?php
if($post->post_parent)
$children = wp_list_pages("title_li=&child_of=".$post->post_parent."&echo=0"); else
$children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
if ($children) { ?>
<ul>
<?php echo $children; ?>
</ul>
<?php } ?>

to list subpages even if on a subpage, and it works like a charm.

I’m using a free theme called “Simplicity”. I used the above code to display the child menu items but it doesn’t work. I’m pasting the code from the files “header.php” and from “style.css”. I hope you could shed some light on this because I’m stumped.

Excerpt from “header.php” file:
<div id=”headermenu”>

<?php
if($post->post_parent)
$children = wp_list_pages(“title_li=&child_of=”.$post->post_parent.”&echo=0″); else
$children = wp_list_pages(“title_li=&child_of=”.$post->ID.”&echo=0″);
$string = wp_list_pages(‘title_li=&echo=0&depth=1’ );
$pattern = ‘ current_page_item “‘;$replacement = ‘” id=”current”‘;
echo str_replace($pattern, $replacement, $string); ?>
if ($children) { echo $children; }

</div><!– headermenu –>

Excerpt from “style.css” file:
/* headermenu */
#headermenu {
padding: 0 1em;
width: auto;
background: transparent;
font-family: ‘Lucida Grande’, Verdana, Helvetica, Sans-Serif;
}
#headermenu ul {
font-size: 11px;
font-weight: bold;
margin: 0;
padding: 0;
list-style: none;
border: 0;
}
#headermenu li {
display: inline;
margin: 0;
padding: 0;
text-transform: uppercase;
}
#headermenu li:first-child { margin-left: 10px; }
#headermenu a {
float: left;
line-height: 1em;
display: block;
background-color: #58a;
color: white;
margin: 0 10px 0 0;
padding: 0.5em 10px;
}
#headermenu a:hover {
background-color: #7ac;
text-decoration: none;
}