Previous and Next are not working

dear Sir,

Pls help, first take a look at this URL below

http://www.inspireasia.com/wp-content/themes/contractor/design-projects.php

my design-projects.php :

<?php require(“/home/inspire/public_html/wp-blog-header.php”); ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

<!– If the post is in the category we want to exclude, we simply pass to the next post. –>
<?php if (in_category(‘1,2,3,4,5,6,7,8,9,10,11,12,13,14’) && is_home() ) continue; ?>

<div class=”post”>
<div class=”entry”>
<?php the_content(); ?>
</div>
</div>

<?php endwhile; else: ?>
Sorry, no posts matched your criteria.
<?php endif; ?>

My Questions :
1. How to have Previous and Next Links on the buttom, because we’ve uploaded about 9 articles for designs.

2. and How to make it run well (the Previous and Next) ?

Thanks your for your help and kind attention