Whitelight woo theme cusomize

Does anyone know how to add feature images to categorys and have them appear on their perant categories page?
In other words go from perant category click to go to child category then click to go to post. here is my archive.php

<?php
$count=0;
while (have_posts()) : the_post();
$count++;
?>
<I></I>

<?php
//design for pages
if ( get_post_type() == 'page') { ?>

    <div class="loop-entry clearfix <?php if($count =='2') { echo 'remove-margin'; } ?>">
    	<h2><a href="<?php the_permalink(' ') ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
    	<?php the_excerpt(); ?>
    </div><!-- END entry -->

<?php } else { ?>
<div class="loop-entry clearfix <?php if($count =='2') { echo 'remove-margin'; } ?>">

	<?php if ( has_post_thumbnail() ) {  ?>
        <div class="loop-entry-thumbnail">
			<a href="<?php the_permalink(' ') ?>" title="<?php the_title(); ?>"><?php the_post_thumbnail('post-image'); ?></a>
        </div>
    <?php } ?>

    	<h2><a href="<?php the_permalink(' ') ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
        <div class="post-meta">

        </div>
    	<?php the_excerpt(''); ?>

</div><!-- END entry -->

<?php } ?>

<?php if($count =='2') { echo '<div class="clear"></div>'; $count=0; } endwhile; ?>

And also I would like to stop child category post from showing on pernats category page. Fix to any of these problems would be greatly appreciated.
Thanks in advance