$user_id, 'user_nicename' => $author_slug ); wp_update_user($update_data); } // Add it to the profile page add_filter('show_user_profile','author_slug_field'); add_action('edit_user_profile', 'author_slug_field'); add_action('personal_options_update', 'save_author_slug_field'); add_action('edit_user_profile_update', 'save_author_slug_field');