Visual or page editor for default search results and cannot find pages

I’m using vantage + WP 4.1.1

Is there any way to make changes to those two pages as you would, say a user created page. The only way I can see how to modify them is via the editor on the main word press menu tree and choosing search.php or whatever.php

This isn’t ideal as I don’t particularly understand much of what the code is doing. All I literally want to do is chuck away the bloggy bits and the new post history bits.

See

<?php
/**
 * The template part for displaying a message that posts cannot be found.
 *
 * Learn more: http://codex.wordpress.org/Template_Hierarchy
 *
 * @package vantage
 * @since vantage 1.0
 * @license GPL 2.0
 */
?>

<article id="post-0" class="post no-results not-found">
	<header class="entry-header">
		<h1 class="entry-title"><?php _e( 'Nothing Found', 'vantage' ); ?></h1>
	</header><!-- .entry-header -->

	<div class="entry-content">
		<?php if ( is_home() && current_user_can( 'publish_posts' ) ) : ?>

			<?php printf( __( 'Ready to publish your first post? <a href="%1$s">Get started here</a>.', 'vantage' ), esc_url( admin_url( 'post-new.php' ) ) ); ?>



		<?php elseif ( is_search() ) : ?>

			<?php _e( 'Sorry, but nothing matched your search terms. Please try again with some different keywords.', 'vantage' ); ?>


			<?php get_search_form(); ?>

		<?php else : ?>

			<?php _e( 'It seems we can’t find what you’re looking for. Perhaps searching can help.', 'vantage' ); ?>


			<?php get_search_form(); ?>

		<?php endif; ?>
	</div><!-- .entry-content -->
</article><!-- #post-0 .post .no-results .not-found -->

<?php
/**
 * The template for displaying Search Results pages.
 *
 * @package vantage
 * @since vantage 1.0
 * @license GPL 2.0
 */

get_header(); ?>

<section id="primary" class="content-area">
	<div id="content" class="site-content" role="main">

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

		<header class="page-header">
			<h1 id="page-title"><?php printf( __( 'Search Results for: %s', 'vantage' ), '<span>' . get_search_query() . '</span>' ); ?></h1>
		</header><!-- .page-header -->

		<?php /* Start the Loop */ ?>
		<?php while ( have_posts() ) : the_post(); ?>

			<?php get_template_part( 'content' ); ?>

		<?php endwhile; ?>

		<?php vantage_content_nav( 'nav-below' ); ?>

	<?php else : ?>

		<?php get_template_part( 'no-results', 'search' ); ?>

	<?php endif; ?>

	</div><!-- #content .site-content -->
</section><!-- #primary .content-area -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

<?php
/**
 * The template for displaying 404 pages (Not Found).
 *
 * @package vantage
 * @since vantage 1.0
 * @license GPL 2.0
 */

get_header(); ?>

<div id="primary" class="content-area">
	<div id="content" class="site-content" role="main">

		<article id="post-0" class="post error404 not-found">

			<div class="entry-main">

				<?php do_action('vantage_entry_main_top') ?>

				<header class="entry-header">
					<h1 class="entry-title"><?php echo apply_filters( 'vantage_404_title', __( "That page can't be found.", 'vantage' ) ); ?></h1>
				</header><!-- .entry-header -->

				<div class="entry-content">
					<?php echo apply_filters( 'vantage_404_message', __( 'It looks like nothing was found at this location. Maybe try one of the links below or a search?', 'vantage' ) ); ?>



					<?php get_search_form(); ?>

					<?php the_widget( 'WP_Widget_Recent_Posts' ); ?>

					<div class="widget">
						<h2 class="widgettitle"><?php _e( 'Most Used Categories', 'vantage' ); ?></h2>
						<ul>
						<?php wp_list_categories( array( 'orderby' => 'count', 'order' => 'DESC', 'show_count' => 1, 'title_li' => '', 'number' => 10 ) ); ?>
						</ul>
					</div><!-- .widget -->

					<?php
					$archive_content = '' . __( 'Try looking in the monthly archives.', 'vantage' ) . '

';
					the_widget( 'WP_Widget_Archives', 'dropdown=1', "after_title=</h2>$archive_content" );
					?>

					<?php the_widget( 'WP_Widget_Tag_Cloud' ); ?>

				</div><!-- .entry-content -->

				<?php do_action('vantage_entry_main_bottom') ?>

			</div><!-- .entry-main -->

		</article><!-- #post-0 .post .error404 .not-found -->

	</div><!-- #content .site-content -->
</div><!-- #primary .content-area -->

<?php get_footer(); ?>