How to Hide email subscription popup Admin Menus

function plt_hide_email_subscribe_menus() {
	//Hide "Email Subscription".
	remove_menu_page('email_subscription_popup');
	//Hide "Email Subscription → Email Subscription Form Setting".
	remove_submenu_page('email_subscription_popup', 'email_subscription_popup');
	//Hide "Email Subscription → Manage Subscribers".
	remove_submenu_page('email_subscription_popup', 'email_subscription_popup_subscribers_management');
	//Hide "Email Subscription → Unsubscribers List".
	remove_submenu_page('email_subscription_popup', 'Newssletter-Email-Unsubscriber');
}

add_action('admin_menu', 'plt_hide_email_subscribe_menus', 11);

Where do I put this code?