Adding Pages to the top of the Menu:

First: open up the header.php from your theme editor.

Second: Look for this line of code:

<div id="top">
<div class="pads clearfix">
<ul>

Third: Then Add this line of code:

<?php wp_list_pages('title_li='); ?>

So the complete code should look like this:

<div id="top">
<div class="pads clearfix">
<ul>
<?php wp_list_pages('title_li='); ?>
&lt;li id="t-search"&gt;&lt;div class="hide"&gt;&lt;?php include (TEMPLATEPATH . '/searchform.php'); ?&gt;&lt;/div&gt;&lt;/li&gt;

To see more information on using pages visit the WorPress Codex here