Load More button is not appearing nor working

I have installed the plugin to my custom theme. But Load More button is not showing on my blog and archive page (index.php / archive.php). I checked the plugin settings but do not understand Load More Button Selector and Load More Items Selector . What to put there? Here is the total code with loop of my blog / archive page.

<section role="main" class="page-container">
<div class="container-fluid">
<div class="row">
<div class="col-12">
<ul class="tiles-wrap animated" id="wookmark1">
<?php 
if (have_posts()) : while (have_posts()) : the_post(); 
$post_thumbnail_id    = get_post_thumbnail_id();
$featured_image    = wp_get_attachment_image_src($post_thumbnail_id, $size='full');
$featured_image_alt = get_post_meta( $post_thumbnail_id, '_wp_attachment_image_alt', true );
?>

<li>
<a class="venoboxinline" data-gall="gall1" data-title="Project name" data-vbtype="inline" href="#project-<?php echo $post->ID;?>">
<?php if ($featured_image):?>
<img src="<?php echo $featured_image[0];?>" alt="<?php echo $featured_image_alt;?>">
<?php endif;?> 
</a>
</li>

<?php endwhile; endif; ?>
</ul>
<div class="postNavigation">
<div class="alignleft"><?php next_posts_link('&laquo; Older Items') ?></div>
<div class="alignright"><?php previous_posts_link('Newer Items &raquo;') ?></div>
</div>		
</div>
</div>
</div>
</section>