Re: Adding navigation buttons to the header
The code to add depends on what links you want to add 
Want to link to Apple?
<li><a href="http://www.apple.com">Apple</a></li>
want to list all your pages?
<?php wp_list_pages(); ?>
want to hard code a link to a contact page (assuming the link is /contact/)
<li><a href="/contact/">Contact</a></li>
etc.
Look in the header.php file and you will see all the links that are currently there.
