Add image on top of first post only

How do I do this?
I want to add an image on top of the first post only here
https://www.woodencotton.com/test1

Here’s my index code

<?php get_header(); ?>

<?php get_sidebar(); ?>

<div id="content">

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

  <?php $post = $posts[0];  ?>

  <?php if (is_category()) { ?>

  <h2 class="pagetitle">‘

    <?php single_cat_title(); ?>

    ’

    <?php _e('category archive','Passit')?>

  </h2>

  <?php  } elseif (is_day()) { ?>

  <h2 class="pagetitle">

    <?php _e('Archive for','Passit')?>

    <?php the_time('F jS, Y'); ?>

  </h2>

  <?php  } elseif (is_month()) { ?>

  <h2 class="pagetitle">

    <?php _e('Archive for','Passit')?>

    <?php the_time('F, Y'); ?>

  </h2>

  <?php } elseif (is_year()) { ?>

  <h2 class="pagetitle">

    <?php _e('Archive for','Passit')?>

    <?php the_time('Y'); ?>

  </h2>

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

  <h2 class="pagetitle">

    <?php _e('Search results for','Passit')?>

    ‘‘<?php echo($s); ?> ’’ </h2>

  <?php } ?>

  <?php while (have_posts()) : the_post(); ?>

<div class="date">

        <?php the_time('M', '', ''); ?>

        <div>

          <?php the_time('d', '', ''); ?>

        </div>

      </div>

  <div class="post" id="post-<?php the_ID(); ?>">

    <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php _e('Permanent Link to','Passit')?> <?php the_title(); ?>">

      <?php the_title(); ?>

      </a></h2>

    <?php if(!is_page()) {  ?>

    <small>

    <?php edit_post_link('e', ' - ', '  '); ?>

    </small>

    <?php }  ?>

    <?php if(!is_search()) :  ?>

    <div class="entry">

      <?php the_content(__('Read the rest of this entry &raquo;')); ?>

    </div>

    <?php endif;  ?>

    <?php if(!is_page()) {  ?>

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

    <ul class="postmetadata alt">

      <li class="details_summary"> <strong>

        <?php _e('Date')?>

        </strong>

        <?php the_time('l, d M y') ?>

        <?php _e('at')?>

        <?php the_time() ?>

      </li>

      <li class="details_summary"><strong>

        <?php _e('Under')?>

        </strong>

        <?php the_category(', ') ?>

      </li>

      <li class="details_summary">

        <?php _e('You can follow any responses to this entry through the','Passit')?>

        <?php comments_rss_link('RSS 2.0'); ?>

        <?php _e('feed')?>

        .</li>

      <?php if (('open' == $post-> comment_status) && ('open' == $post->ping_status)) {

							?>

      <li class="details_summary">

        <?php _e('You can')?>

        <a href="#respond">

        <?php _e('leave a response')?>

        </a>,

        <?php _e('or','Passit')?>

        <a href="<?php trackback_url(true); ?>" rel="trackback">trackback</a>

        <?php _e('from your own site')?>

        . </li>

      <?php } elseif (!('open' == $post-> comment_status) && ('open' == $post->ping_status)) {

							 ?>

      <li class="details_l">

        <?php _e('Responses are currently closed, but you can')?>

        <a href="<?php trackback_url(true); ?> " rel="trackback">trackback</a>

        <?php _e('from your own site')?>

        .</li>

      <?php } elseif (('open' == $post-> comment_status) && !('open' == $post->ping_status)) {

							 ?>

      <li class="details_l">

        <?php _e('You can skip to the end and leave a response. Pinging is currently not allowed')?>

        .</li>

      <?php } elseif (!('open' == $post-> comment_status) && !('open' == $post->ping_status)) {

							 ?>

      <li class="details_l">

        <?php _e('Both comments and pings are currently closed')?>

        .</li>

      <?php } ?>

    </ul>

    <?php else :  ?>

    <ul class="postmetadata">

      <li class="details_r">

        <?php comments_popup_link(__('No Comments'),__('1 Comment'),__('% Comments')); ?>

      </li>

      <li class="details_l">

        <?php _e('Posted in')?>

        <?php the_category(', ') ?>

      </li>

    </ul>

    <?php endif; ?>

    <?php }  ?>

  </div>

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

  <?php comments_template(); ?>

  <?php endif;  ?>

  <?php endwhile; ?>

  <?php if(is_single() || is_page() ) :  ?>

  <?php else: ?>

  <div class="navigation">

    <div class="alignleft">

      <?php next_posts_link(__('Previous Entries')); ?>

    </div>

    <div class="alignright">

      <?php previous_posts_link(__('Next Entries')); ?>

    </div>

  </div>

  <?php endif;  ?>

  <?php else : ?>

  <?php include (TEMPLATEPATH . '/notfound.php');?>

  <?php endif; ?>

</div>

<?php include (TEMPLATEPATH . "/sidebartwo.php"); ?>

<?php get_footer(); ?>