How to Hide News-Parser Admin Menus

function plt_hide_news_parser_menus() {
	//Hide "News Parser".
	remove_menu_page('news-parser-main-menu');
	//Hide "News Parser → Parsing RSS".
	remove_submenu_page('news-parser-main-menu', 'news-parser-main-menu');
	//Hide "News Parser → Parsing page".
	remove_submenu_page('news-parser-main-menu', 'news-parser-menu-parse-page');
	//Hide "News Parser → Autopilot".
	remove_submenu_page('news-parser-main-menu', 'news-parser-menu-autopilot');
	//Hide "News Parser → About".
	remove_submenu_page('news-parser-main-menu', 'news-parser-menu-about');
}

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

Where do I put this code?