How to Hide YayMail - WooCommerce Email Customizer Admin Menus

function plt_hide_yaymail_menus() {
	//Hide "YayCommerce".
	remove_menu_page('yaycommerce');
	//Hide "YayCommerce → YayMail".
	remove_submenu_page('yaycommerce', 'yaymail-settings');
	//Hide "YayCommerce → Help".
	remove_submenu_page('yaycommerce', 'yaycommerce-help');
	//Hide "YayCommerce → Recommended Plugins".
	remove_submenu_page('yaycommerce', 'yaycommerce-other-plugins');
}

add_action('admin_menu', 'plt_hide_yaymail_menus', 1000);

Where do I put this code?