How to Hide Iks Menu Admin Menus

function plt_hide_iks_menu_menus() {
	//Hide "Iks Menu FAQs".
	remove_menu_page('edit.php?post_type=iksm_faq');
	//Hide "Iks Menu FAQs → Iks Menu FAQs".
	remove_submenu_page('edit.php?post_type=iksm_faq', 'edit.php?post_type=iksm_faq');
	//Hide "Iks Menu FAQs → Adding FAQ".
	remove_submenu_page('edit.php?post_type=iksm_faq', 'post-new.php?post_type=iksm_faq');
	//Hide "Iks Menu FAQs → Groups".
	remove_submenu_page('edit.php?post_type=iksm_faq', 'edit-tags.php?taxonomy=iksm_faq_group&post_type=iksm_faq');

	//Hide "Iks Menu".
	remove_menu_page('iksm');
	//Hide "Iks Menu → Iks Menu".
	remove_submenu_page('iksm', 'iksm');
	//Hide "Iks Menu → Contact Us".
	remove_submenu_page('iksm', 'iksm-contact');
	//Hide "Iks Menu → Support Forum".
	remove_submenu_page('iksm', 'iksm-wp-support-forum');
	//Hide "Iks Menu → Upgrade".
	remove_submenu_page('iksm', 'iksm-pricing');
}

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