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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

// First, create a function that includes the path to your favicon
function add_favicon() {
    $favicon_url = get_stylesheet_directory_uri() . '/images/favicon.ico';
    echo '<link rel="shortcut icon" href="' . $favicon_url . '" />';
}

// Now, just make sure that function runs when you're on the login page and admin pages
add_action( 'login_head', 'add_favicon' );
add_action( 'admin_head', 'add_favicon' );