How to Hide Ultimate Lightbox Admin Menus

function plt_hide_ultimate_lightbox_menus() {
	//Hide the "Lightbox" menu.
	remove_menu_page('ulb-settings');
	//Hide the "Lightbox → Lightbox" menu.
	remove_submenu_page('ulb-settings', 'ulb-settings');
	//Hide the "Lightbox → About Us" menu.
	remove_submenu_page('ulb-settings', 'ewd-ulb-about-us');
}

add_action('admin_menu', 'plt_hide_ultimate_lightbox_menus', 12);

Where do I put this code?