Background Help?

Im using the theme “Structure”, this topic has never been addressed in their support files,
I want to add a full width header background.
This theme has header presets, the set i’m using is #3.

Could use some help on adding this image to the php file for header #3.

__________

<div class=”header-wrapper”>
<?php
global $thememove_header_top;
if((get_theme_mod( ‘header_top_enable’,header_top_enable) || $thememove_header_top == ‘enable’) && $thememove_header_top != ‘disable’){ ?>
<div class=”top-area”>
<div class=”container”>
<div class=”row”>
<div class=”col-md-8 hidden-xs hidden-sm”>
<?php dynamic_sidebar( ‘top-area’ ); ?>
</div>
<div class=”col-md-4 social”>
<?php wp_nav_menu( array( ‘theme_location’ => ‘social’,’fallback_cb’ => false ) ); ?>
</div>
</div>
</div>
</div>
<?php } ?>
<header <?php header_class(); ?> role=”banner” itemscope=”itemscope” itemtype=”http://schema.org/WPHeader”&gt;
<div class=”container”>
<div class=”row”>
<div class=”col-md-3″>
<div class=”site-branding”>
<?php
global $thememove_custom_logo;
if($thememove_custom_logo){ ?>
” rel=”home”>
<img src=”<?php echo $thememove_custom_logo; ?>” alt=”logo”/>

<?php }else{ ?>
<?php if(get_theme_mod( ‘normal_logo_image’,normal_logo_image)){ ?>
” rel=”home”>
<img src=”<?php echo get_theme_mod(‘normal_logo_image’,normal_logo_image); ?>” alt=”logo”/>

<?php }else{ ?>
<h1 class=”site-title”>” rel=”home”><?php bloginfo( ‘name’ ); ?></h1>
<?php } ?>
<?php } ?>
</div>
</div>
<div class=”col-md-9 hidden-xs hidden-sm hidden-md header-right”>
<?php dynamic_sidebar( ‘header-right’ ); ?>
</div>
</div>
</div>
</header>
<div class=”nav”>
<div class=”container”>
<span class=”menu-link”><i class=”fa fa-navicon”></i></span>
<nav class=”navigation” role=”navigation”>
<?php wp_nav_menu( array( ‘theme_location’ => ‘primary’) ); ?>
</nav><!– .site-navigation –>
</div>
</div>
</div>

___________

Will appreciate any help you can give me!!!
Thanks
Mike