<?php query_posts('showposts=3&orderby=date&cat=6'); ?>

Yerine

<?php query_posts("showposts=4&posts_per_page=1&paged=".get_query_var( 'page' )); ?>  
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?> 
<?php endwhile; else: ?> 
(SAYFALAMA)
<?php endif; ?>

    <div class="grid_8"> 

<?php query_posts("showposts=4&posts_per_page=1&cat=6&paged=".get_query_var( 'page' )); ?>  
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?> 

    <div class="wrapper">
			<?php if ( has_post_thumbnail() ) the_post_thumbnail('mksy-thumb', array('class' => 'imgIndent')); else echo 'Resim Eklenmemiş'; ?>           

    <div class="box">
						
			<h2><?php the_title(''); ?></h2>
			<p class="comments">EKLENME TARİHİ <?php the_time();?> <?php the_date();?> YAZAR: <?php the_author();?></p>
			<p><?php the_excerpt();?> <a href="<?php the_permalink('') ?>" class="more_btn">Devamı</a></p>
                        

    </div>
    </div>	<?php endwhile; else: ?> 				
			<?php endif; ?><?php sayfalama(); ?>
    </div>