Hi Katrina,
please do the following to place the header image above the navigation:
Log-in to your backend and navigate to Appearence -> Editor.
Then select the Twenty Twelve Theme (right-top).
Open the header.php of the Twenty Twelve Theme and search for the following code:
<?php $header_image = get_header_image();
if ( ! empty( $header_image ) ) : ?>
<a href="<?php echo esc_url( home_url( '/' ) ); ?>"><img src="<?php echo esc_url( $header_image ); ?>" class="header-image" width="<?php echo get_custom_header()->width; ?>" height="<?php echo get_custom_header()->height; ?>" alt="" /></a>
<?php endif; ?>
</header><!-- #masthead -->
Now put the found code above after the following code:
<header id="masthead" class="site-header" role="banner">
<hgroup>
<h1 class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></h1>
<h2 class="site-description"><?php bloginfo( 'description' ); ?></h2>
</hgroup>
Then the new code should look like this and the header image should appear under the description and above the navigation:
<hgroup>
<h1 class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></h1>
<h2 class="site-description"><?php bloginfo( 'description' ); ?></h2>
</hgroup>
<?php $header_image = get_header_image();
if ( ! empty( $header_image ) ) : ?>
<a href="<?php echo esc_url( home_url( '/' ) ); ?>"><img src="<?php echo esc_url( $header_image ); ?>" class="header-image" width="<?php echo get_custom_header()->width; ?>" height="<?php echo get_custom_header()->height; ?>" alt="" /></a>
<?php endif; ?>
</header><!-- #masthead -->
Kind regards,
Christopher