How to Hide StellaCodex Post Carousel Admin Menus

function plt_hide_stellacodex_post_carousel_menus() {
	//Hide "Post Carousels".
	remove_menu_page('stellacodex-post-carousel');
	//Hide "Post Carousels → All Carousels".
	remove_submenu_page('stellacodex-post-carousel', 'stellacodex-post-carousel');
	//Hide "Post Carousels → Add New".
	remove_submenu_page('stellacodex-post-carousel', 'stellacodex-post-carousel-new');
	//Hide "Post Carousels → Settings".
	remove_submenu_page('stellacodex-post-carousel', 'stellacodex-post-carousel-settings');
	//Hide "Post Carousels → Contact Us".
	remove_submenu_page('stellacodex-post-carousel', 'stellacodex-post-carousel-contact');
	//Hide "Post Carousels → Upgrade".
	remove_submenu_page('stellacodex-post-carousel', 'stellacodex-post-carousel-pricing');
}

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