R u kidding? A single.php is something like that:
<?php get_header(); ?>
<main role="main">
<!-- section -->
<section>
<?php if (have_posts()): while (have_posts()) : the_post(); ?>
<!-- article -->
<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<!-- post thumbnail -->
<?php if ( has_post_thumbnail()) : // Check if Thumbnail exists ?>
<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
<?php the_post_thumbnail(); // Fullsize image for the single post ?>
</a>
<?php endif; ?>
<!-- /post thumbnail -->
<!-- post title -->
<h1>
<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a>
</h1>
<!-- /post title -->
<!-- post details -->
<span class="date"><?php the_time('F j, Y'); ?> <?php the_time('g:i a'); ?></span>
<span class="author"><?php _e( 'Published by', 'html5blank' ); ?> <?php the_author_posts_link(); ?></span>
<span class="comments"><?php if (comments_open( get_the_ID() ) ) comments_popup_link( __( 'Leave your thoughts', 'html5blank' ), __( '1 Comment', 'html5blank' ), __( '% Comments', 'html5blank' )); ?></span>
<!-- /post details -->
<?php the_content(); // Dynamic Content ?>
<?php the_tags( __( 'Tags: ', 'html5blank' ), ', ', '<br>'); // Separated by commas with a line break at the end ?>
<p><?php _e( 'Categorised in: ', 'html5blank' ); the_category(', '); // Separated by commas ?></p>
<p><?php _e( 'This post was written by ', 'html5blank' ); the_author(); ?></p>
<?php edit_post_link(); // Always handy to have Edit Post Links available ?>
<?php comments_template(); ?>
</article>
<!-- /article -->
<?php endwhile; ?>
<?php else: ?>
<!-- article -->
<article>
<h1><?php _e( 'Sorry, nothing to display.', 'html5blank' ); ?></h1>
</article>
<!-- /article -->
<?php endif; ?>
</section>
<!-- /section -->
</main>
<?php get_sidebar(); ?>
<?php get_footer(); ?>
That is very basic single.php. Go to wpadmin>Appearance>Editor>single.php then copy all code and edit above code and pest there.
