Oh, sorry, I misread your reply. Currently, my index.php is:
<?php get_header(); ?>
<div id="content">
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
<div class="post" id="post-<?php the_ID(); ?>">
<div class="date"><span><?php the_time('M') ?></span> <?php the_time('d') ?></div>
<div class="title">
<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>
<div class="postdata"><SPAN class="category"><?php the_category(', ') ?></SPAN> <span class="comments"><?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></span></div>
</div>
<div class="entry">
<?php the_content('Continue reading »'); ?>
</div><!--/entry -->
</div><!--/post -->
<?php endwhile; ?>
<div class="page-nav"> <span class="previous-entries"><?php next_posts_link('Previous Entries') ?></span> <span class="next-entries"><?php previous_posts_link('Next Entries') ?></span></div><!-- /page nav -->
<?php else : ?>
<h2>Not Found</h2>
<p>Sorry, but you are looking for something that isn't here.</p>
<?php endif; ?>
</div><!--/content -->
<div id="footer">
<a href="https://www.ndesign-studio.com/resources/wp-themes/">WP Theme</a> & <a href="https://www.ndesign-studio.com/stock-icons/">Icons</a> by <a href="https://www.ndesign-studio.com">N.Design Studio</a>
<span id="mangoorange">, columnized by <a href="https://www.mangoorange.com/">MangoOrange</a></span>
</div>
</div><!--/left-col -->
<?php get_sidebar(); ?>
<?php get_footer(); ?>
So how would I enter this correctly? After I do, it gives me an error message.