Change the showpost number from 3 to whatever number of posts you want to show.

<?php
/* Start the Loop AND limit the # of posts*/
$page_num = $paged;
if ($pagenum='') $pagenum =1;
query_posts('showposts=5&paged='.$page_num); ?>

You have to place it just before:

<?php while ( have_posts() ) : the_post(); ?>