Add pages to archive.php

On my WordPress site, https://day4ministries.com, categories, authors, etc. all come from archive.php.
These pages aren’t paginating (Displaying “More” or “Previous Posts”/”Newer Posts”) at the bottom.

Example:
https://www.day4ministries.com/?page_id=64

How do I add this functionality?

Here is archive.php

<?php get_header(); ?>

<div id="sub-column">

        <div id="sub-top">
                <?php get_template_part('scripts/breadcrumb'); ?>
        </div>

        <div id="sub-content">

                <div class="content">

                        <?php if (have_posts()) :
                        echo"<h1 class='first'>"; ?>

                        <?php if (is_day()) { ?>
                        <?php the_time(get_option('date_format')); ?>

                        <?php } elseif (is_month()) { ?>
                        Archive for <?php the_time('F, Y'); ?>

                        <?php } elseif (is_category()) { ?>
                        <h1><?php echo single_cat_title(); ?></h1>
			<div class="catdesc"><?php echo category_description( $category ); ?></div>

			<?php } elseif (is_author()) { ?>
   			<?php $curauth = (isset($_GET['author_name'])) ? get_user_by('slug', $author_name) : get_userdata(intval($author)); ?>
			<h1><?php echo $curauth->nickname; ?></h1>
			<div class="alignleft"><?php userphoto($wp_query->get_queried_object()) ?></div>
			<?php echo $curauth->description; ?>
			<br />
			<h1>Interact with <?php echo $curauth->first_name; ?>:</h1>
			<h2><dd><a href="<?php echo $curauth->user_url; ?>">Check out <?php echo $curauth->first_name; ?>'s Blog</a></dd></h2>
			<h2><dd><a href="<?php echo $curauth->twitter; ?>">Follow <?php echo $curauth->first_name; ?> on Twitter</a></dd></h2>
			<h2><dd><a href="<?php echo $curauth->facebook; ?>">Like <?php echo $curauth->first_name; ?> on Facebook</a></dd></h2>
			<h2><dd><a href="<?php echo $curauth->youtube; ?>">Watch <?php echo $curauth->first_name; ?> on YouTube</a></dd></h2>
			<h2><dd><a href="<?php echo $curauth->googleplus; ?>">Cicle <?php echo $curauth->first_name; ?> on Google+</a></dd></h2>
			<br />
			<br />
			<br />
			<h1><b>Latest Posts:</b></h1>

                        <?php } elseif (is_year()) { ?>
                        Archive for <?php the_time('Y'); ?>

                        <?php } elseif (is_search()) { ?>
                        Search Results

                        <?php } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
                        Blog Archives
                        <?php }
                        echo"</h1>";
                        while (have_posts()) : the_post();
                        $wpcx_thumb = wpcx_get_wp_generated_thumb("reference");
                        ?>

                                <div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
                                        <h1><a href="<?php the_permalink();?>" title="<?php the_title();?>"><?php the_title();?></a></h1>
                                        <div class="post_meta">
                                                <span class="category">
                                                        <?php
                                                                $wpcx_category = get_the_category();
                                                                $wpcx_name = $wpcx_category[0]->cat_name;
                                                                $wpcx_id = $wpcx_category[0]->cat_ID;
                                                                $wpcx_link = get_category_link($wpcx_id);
                                                                echo "<a href='$wpcx_link' title='$wpcx_name'>$wpcx_name</a>";
                                                        ?>
                                                </span>
                                                <span class="date">Published <?php the_time(get_option('date_format')); ?> at <?php the_time(get_option('time_format'));?></span>
                                                <span class="comment_meta"><?php comments_popup_link('No Comments', '1 Comment', '% Comments'); ?></span>
<br />
                                                <span class="social">
							<?php

							if(!empty($wpcx_cxOptions["social_fb_like"])) {

								if($wpcx_cxOptions["social_fb_like"] == "yes") {

								?>

									<iframe src="https://www.facebook.com/plugins/like.php?href=<?php echo urlencode(get_permalink($post->ID)); ?>&layout=button_count&show_faces=false&width=75&action=like&font&colorscheme=light&height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:75px; height:21px;" allowTransparency="true"></iframe>

								<?php

								}

							}

							?>
							<a href="https://twitter.com/share" class="twitter-share-button" data-via="Day4Ministries">Tweet</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>
							<?php

							if(!empty($wpcx_cxOptions["social_google_like"])) {

								if($wpcx_cxOptions["social_google_like"] == "yes") {

								?>

									<span class="google"><g:plusone size="medium"></g:plusone></span>

								<?php

								}

							}

							?>

						</span>
                                        </div>

                                        <?php

                                        if(!empty($wpcx_thumb)) {

                                                 ?>
                                                 <div class="with_image">

                                                 <img src="<?php echo $wpcx_thumb;?>" />

                                                 <?php

                                        } else {

                                                 echo "<div class='no_image'>";

                                        }

                                        ?>

                                        <?php the_excerpt();?>

                                                </div>
                                </div>

                        <?php endwhile; else: ?>

                                <div class="post">
                                        <h1>Nothing found</h1>
                                        <p>Sorry, no posts matched your criteria.</p>
                                </div>

                        <?php endif; ?>

                        <?php

                        get_template_part('scripts/wp-pagenavi');

                        if(function_exists('wp_pagenavi')) {
                                wp_pagenavi();
                        } else {
                                wp_link_pages();
                        }

                        ?>

                </div>

<?php get_sidebar(); ?>            

<?php get_footer(); ?>