How to Hide FreshenUp Admin Menus

function plt_hide_freshenup_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "Freshenup".
	remove_menu_page('freshenup');
	//Hide "Freshenup → Settings".
	remove_submenu_page('freshenup', 'freshenup');
	//Hide "Freshenup → Prompt".
	remove_submenu_page('freshenup', 'freshenup_prompt');
	//Hide "Freshenup → Awaiting approval".
	remove_submenu_page('freshenup', 'freshenup_review');
	//Hide "Freshenup → Approved".
	remove_submenu_page('freshenup', 'freshenup_approved');
	//Hide "Freshenup → Contact Us".
	remove_submenu_page('freshenup', 'freshenup-contact');
	//Hide "Freshenup → Upgrade".
	remove_submenu_page('freshenup', 'freshenup-pricing');
}

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