Tips on Customizing Ping Watcher

How to Hide the "PingWatcher" Admin Menu

function plt_hide_ping_watcher_menus() {
	//Hide the "Settings → PingWatcher" menu.
	remove_submenu_page('options-general.php', 'pingwatcher.php');
}

add_action('admin_menu', 'plt_hide_ping_watcher_menus', 11);

Where do I put this code?

How to Hide the "Ping Watcher" Dashboard Widget

function plt_hide_ping_watcher_dashboard_widgets() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Remove the "Ping Watcher" widget.
	remove_meta_box('mitt_pw_ping_error_widget', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_ping_watcher_dashboard_widgets', 20);