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// CAMBIA IMMAGINE, URL E TITOLO NELLA PAGINE LOGIN WP-ADMIN
// https://codex.wordpress.org/Customizing_the_Login_Form
function my_login_logo() { ?>
    <style type="text/css">
        #login h1 a, .login h1 a {
            background-image: url(<?php echo get_stylesheet_directory_uri(); ?>/IMMAGINE.png);
            background-size: 300px auto;
			    width: 300px;
        }
    </style>
<?php }
add_action( 'login_enqueue_scripts', 'my_login_logo' );

function my_login_logo_url() {
    return home_url();
}
add_filter( 'login_headerurl', 'my_login_logo_url' );

function my_login_logo_url_title() {
    return 'MODIFICA TITOLO';
}
add_filter( 'login_headertitle', 'my_login_logo_url_title' );