use JQuery to wordpress admin page wp-admin

Solution:

You can use WP admin_footer action hook to add custom js to the admin side. check below code. code will go in the active theme functions.php file.

function add_custom_admin_js(){
    ?>
    <script type="text/javascript">
        (function($){
            $("#postbox-container-1").ready(function(){
                alert("now what?");  
                $('p:contains("Poivre")').css('color', 'red');
            });
        })(jQuery);
    </script>
    <?php
}

add_action( 'admin_footer', 'add_custom_admin_js', 10, 1 );