How to Hide PackPilot Admin Menus

function plt_hide_packpilot_menus() {
	//Hide "PackPilot".
	remove_menu_page('packpilot_main');
	//Hide "PackPilot → Dashboard".
	remove_submenu_page('packpilot_main', 'packpilot_main');
	//Hide "PackPilot → Packing Table".
	remove_submenu_page('packpilot_main', 'packpilot_pick_pack');
	//Hide "PackPilot → Articles".
	remove_submenu_page('packpilot_main', 'packpilot_articles');
	//Hide "PackPilot → Batch & Serial Tracking".
	remove_submenu_page('packpilot_main', 'packpilot_serial_number_report');
	//Hide "PackPilot → Settings".
	remove_submenu_page('packpilot_main', 'packpilot_settings');
	//Hide "PackPilot → Doku".
	remove_submenu_page('packpilot_main', 'packpilot_doku');
	//Hide "PackPilot → Contact Us".
	remove_submenu_page('packpilot_main', 'packpilot_main-contact');
	//Hide "PackPilot → Support Forum".
	remove_submenu_page('packpilot_main', 'packpilot_main-wp-support-forum');
	//Hide "PackPilot → Upgrade".
	remove_submenu_page('packpilot_main', 'packpilot_main-pricing');
}

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