Category coding help

Hello
I’m trying to get my website working the way I want it to. I’m a theme called gridphoto, and the categories shows 8 posts on each page. But I would like it to show all my posts in one page. Can someone help me out here?

Here’s the code.

get_header(); ?>

			<div id="main-photos">

			<?php if ( have_posts() ) : ?>

				<?php /* Start the Loop */ ?>
                <?php $imgDefault = array ('bamboo-460x460.jpg','bird-460x460.jpg','brown-460x460.jpg','coffee-cups-460x460.jpg','fruit-460x460.jpg','halloween-460x460.jpg','shell-460x460.jpg'); $i = 0; $j = 0;
				?>

				<?php while ( have_posts() && ($j < $gridphoto_option['gridphoto_homepage_posts_nr']) ) : the_post(); ?>

				<div class="four columns home-thumb">

				<?php if ( has_post_thumbnail() ) :  ?>
					<a>">
						<?php the_post_thumbnail('thumbnail'); ?>
					</a>
				<?php else: ?>
                        <a>">
                        <img src="<?php echo get_template_directory_uri();?>/images/<?php echo $imgDefault[$i]; ?>" class="attachment-thumbnail wp-post-image" />
                        </a>
                        <?php $i++; if ($i == 6) $i = 0; ?>
				<?php endif; ?>

					<div class="overlay2">

						<h3 class="entry-title"><?php if (strlen($post->post_title) > 20) {
								echo substr(the_title($before = '', $after = '', FALSE), 0, 20) . '...'; } else {
								the_title();
								} ?>
						</h3>

					<!--END .overlay -->
					</div>
				</div>				

				</article>
				<? $j++; ?>

				<?php endwhile; ?>

				<br class="clear">
			   </div>  <!-- End Main -->
			  <?php /* Display navigation to next/previous pages when applicable */ ?>

				<?php if (  $wp_query->max_num_pages > 1 ) : ?>

				  <nav id="nav-below">
					<div class="nav-previous"><?php previous_posts_link(); ?></div>
					<div class="nav-next"><?php next_posts_link(); ?></div>
				  </nav><!-- #nav-below -->

				<?php endif; ?>

				<?php /* Only load comments on single post/pages*/ ?>
				<?php if(is_page() || is_single()) :

				   comments_template( '', true );
				 endif; ?>

		<?php else : ?>

				<article id="post-0" class="post no-results not-found">
					<header class="entry-header">
						<h1 class="entry-title"><?php _e( 'Nothing Found', 'gridphoto' ); ?></h1>
					</header><!-- .entry-header -->

					<div class="entry-content">
						<p><?php _e( 'It seems we can’t find what you’re looking for. Perhaps searching can help.', 'gridphoto' ); ?></p>
						<?php get_search_form(); ?>
					</div><!-- .entry-content -->
				</article><!-- #post-0 -->

		<?php endif; ?>

			</div><!-- #content -->

<?php get_footer(); ?>

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