How to post php code in header.php !

Hellow ,
I m a newbie to wordpress and dunt know much about php .

The thing is i want to add a code to header.php but my themes header show

<?php defined( 'ABSPATH' ) OR die( 'This script cannot be accessed directly.' );

/**
 * The template for displaying pages headers
 *
 * Please do not overload this file directly. Instead have a look at framework/templates/header.php: you should find all
 * the needed hooks there.
 */

us_load_template( 'templates/header' );

Now the thing is , I got to framework/templates/header.php , Idunt know where to paste the code .