How to Hide Tweakr - Utility Toolkit Admin Menus

function plt_hide_tweakr_menus() {
	//Hide "Tweakr".
	remove_menu_page('tweakr-tweaks');
	//Hide "Tweakr → Tweaks".
	remove_submenu_page('tweakr-tweaks', 'tweakr-tweaks');
	//Hide "Tweakr → Analytics".
	remove_submenu_page('tweakr-tweaks', 'tweakr-analytics');
	//Hide "Tweakr → System".
	remove_submenu_page('tweakr-tweaks', 'tweakr-system');
	//Hide "Tweakr → About".
	remove_submenu_page('tweakr-tweaks', 'tweakr-about');
}

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

Where do I put this code?