How to Hide Forms to Zapier Admin Menus

function plt_hide_forms_to_zapier_menus() {
	//Hide "Forms to Zapier".
	remove_menu_page('forms-to-zapier');
	//Hide "Forms to Zapier → Integrations".
	remove_submenu_page('forms-to-zapier', 'forms-to-zapier');
	//Hide "Forms to Zapier → Add New".
	remove_submenu_page('forms-to-zapier', 'forms-to-zapier-new');
	//Hide "Forms to Zapier → Contact Us".
	remove_submenu_page('forms-to-zapier', 'forms-to-zapier-contact');
	//Hide "Forms to Zapier → Upgrade".
	remove_submenu_page('forms-to-zapier', 'forms-to-zapier-pricing');
}

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