How to Hide DataAgent Admin Menus

function plt_hide_dataagent_menus() {
	//Hide "DataAgent".
	remove_menu_page('dataagent');
	//Hide "DataAgent → DataAgent".
	remove_submenu_page('dataagent', 'dataagent');
	//Hide "DataAgent → Settings".
	remove_submenu_page('dataagent', 'dataagent-settings');
	//Hide "DataAgent → Contact Us".
	remove_submenu_page('dataagent', 'dataagent-contact');
	//Hide "DataAgent → Support Forum".
	remove_submenu_page('dataagent', 'dataagent-wp-support-forum');
	//Hide "DataAgent → Upgrade".
	remove_submenu_page('dataagent', 'dataagent-pricing');
}

add_action('admin_menu', 'plt_hide_dataagent_menus', 1000000000);
Where do I put this code?