New page for search cannot be viewed

OK so I noticed my searchbar didn’t work in my sidebar that runs througout the site and looked into the root and there was no searchpage.php or even search.php in my theme root. I am very limited in knowledge with php or with wordpress so please bear with me here.

I followed https://codex.www.ads-software.com/Creating_a_Search_Page from “using the page.php all the way till creating a page titled search using the new template as instructed. The page just cannot be viewed it just redirects me to the homepage, all other pages can be viewed no problem. I also noticed there are some obvious out of date areas on this codex page as well. I’ll give you the code for the searchbar and the new searchpage.php I created. Hopefully after someone can explain to me why my new page cannot be viewed they can help me get the searchbar and search page working.

<div id="searchBox"><form role="search" method="get" id="searchform" action="<?php echo home_url( '/' ); ?>">
    	<div><label class="screen-reader-text" for="s"></label>
        <input type="text" value="" name="s" id="s" />
        <input type="submit" id="searchsubmit" value="Search" />
    	</div>
		</form></div>

my searchpage.php file which I think I did completely wrong

<?php
/*
Template Name: Search Page
*/
?>
<?php get_header( 'single' ); ?>

<!-- this is the page template -->

  <div id="singlepostadvert"><img src="<?php bloginfo('template_directory'); ?>/images/advert_example_728x90.png" width="729" height="90" alt="Advert" /></div>

<div class="forumpostarea">

<!--Here's where the loop starts-->

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

<div class="forumpost"><!-- Styles container for each post -->

  <h2><?php the_title(); ?></h2>

  <div class="entry">
  <?php get_search_form(); ?>
  </div>
  </div><!-- Close post -->
  <?php endwhile; else: ?>
  <div class="forumpost">
    <p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
  </div>
  <?php endif; ?>
</div><!-- Close postarea -->

<?php get_footer(); ?>