Please use below code in your header.php file
<?php
global $gaming;
?>
<!DOCTYPE html>
<html <?php language_attributes(); ?> class="no-js">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Streamer</title>
<!-- fav icon -->
<?php if($gaming['site_favicon_upload']['url']!=""){?>
<link rel="icon" href="https://wordpress.stackexchange.com/questions/310192/<?php echo $gaming["site_favicon_upload']['url'];?>"
sizes="16x16">
<?php }?>
<?php wp_head();?>
</head>
<body <?php body_class();?>>
<script>
jQuery(document).ready(function(){
jQuery(".nav ul > li:nth-child(2)").after('<div class="logo" ><a href="<?php echo esc_url( home_url( "https://wordpress.stackexchange.com/" ) ); ?>"><img src="https://wordpress.stackexchange.com/questions/310192/<?php echo $gaming["site_logo_upload']['url'];?>" alt=""></a></div>');
});
</script>
<div class="wrapper">
<header class="header">
<div class="header-main">
<div class="container">
<div class="col-md-3 col-sm-3 col-xs-12">
<form action="<?php echo esc_url( home_url( "https://wordpress.stackexchange.com/" ) ); ?>" method="get">
<input type="text" name="s" id="search" value="<?php
the_search_query(); ?>" />
<input type="submit" placeholder="">
</form>
</div><!--col-md-3 col-sm-3 col-xs-12-->
<div class="col-md-6 col-sm-6 col-xs-12">
<nav class="nav">
<?php
wp_nav_menu( array(
'theme_location' => 'nav',
'menu_class' => '',
'container' => 'ul',
'container_class' => '',
'container_id' => '',
) );
?>
</nav><!--nav-->
</div><!--col-md-6 col-sm-3 col-xs-12-->
<div class="col-md-3 col-sm-3 col-xs-12 header-right">
<a href="https://wordpress.stackexchange.com/questions/310192/<?php echo $gaming["btn_url'];?>" class="btn">JOIN US NOW</a>
</div><!--col-md-3 col-sm-3 col-xs-12-->
</div><!--container-->
</div><!--header-main-->
</header><!--header-->