Needed a popup with this indicator

using System;
using cAlgo.API;
using cAlgo.API.Internals;
using cAlgo.API.Indicators;
using cAlgo.Indicators;
using System.Collections.Generic;
using System.Net;


namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.Internet)]
    public class AlertForIndicator : Indicator
    {
        [Parameter("Fast Line", Group = "Source")]
        public DataSeries Fast { get; set; }
        [Parameter("Slow Line", Group = "Source")]
        public DataSeries Slow { get; set; }

        [Parameter("Long Signal", Group = "Signal", DefaultValue = false)]
        public bool Long { get; set; }
        [Parameter("Short Signal", Group = "Signal", DefaultValue = false)]
        public bool Short { get; set; }
        [Parameter("Arrow on Chart", Group = "Signal", DefaultValue = true)]
        public bool Arrow { get; set; }
        [Parameter("Backtest", Group = "Signal", DefaultValue = false)]
        public bool Bckt { get; set; }
        [Parameter("Email", Group = "Notification", DefaultValue = false)]
        public bool SendEmail { get; set; }
        [Parameter("Telegram", Group = "Notification")]
        public bool SendTelegram { get; set; }
        [Parameter("Sound ON", Group = "Notification", DefaultValue = true)]
        public bool PlaySound { get; set; }
        [Parameter("Media File Location", Group = "Notification", DefaultValue = "c:\\windows\\media\\Alarm01.Wav")]
        public string MediaFile { get; set; }
        [Parameter("From", Group = "Email", DefaultValue = "from@example.com")]
        public string Sender { get; set; }
        [Parameter("To", Group = "Email", DefaultValue = "to@example.com")]
        public string Receiver { get; set; }
        [Parameter("Subject", Group = "Email", DefaultValue = "my subject")]
        public string Subject { get; set; }
        [Parameter("Message", Group = "Email", DefaultValue = "")]
        public string EmailBody { get; set; }
        [Parameter("ChatId", Group = "Telegram", DefaultValue = "")]
        public string ChatId { get; set; }
        [Parameter("Token", Group = "Telegram", DefaultValue = "")]
        public string BotToken { get; set; }
        [Parameter("Cross Up Color", Group = "Colors", DefaultValue = "Lime")]
        public string ColorArrowUP { get; set; }
        [Parameter("Cross Down Color", Group = "Colors", DefaultValue = "Orange")]
        public string ColorArrowDW { get; set; }


        string TelgramURL;


        protected override void Initialize()
        {
            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
            TelgramURL = string.Format("https://api.telegram.org/bot{0}/sendMessage?chat_id={1}&text=", BotToken, ChatId);
        }

        int LastBar = 0;
        public override void Calculate(int index)
        {
            if (index <= LastBar)
                return;

            LastBar = index;

            string message = Symbol.Name + "\n" + Symbol.Bid + "\n" + TimeFrame;

            if (Long && Fast.HasCrossedAbove(Slow, 0))
            {
                if (PlaySound)
                    Notifications.PlaySound(MediaFile);
                if (SendEmail)
                    Notifications.SendEmail(Sender, Receiver, Subject, EmailBody + " " + message + " " + "Cross Long Signal");
                if (Arrow)
                    Chart.DrawIcon(Bckt ? "Up" + index : "Up", ChartIconType.UpArrow, index, Bars[LastBar - 5].Low, Color.FromName(ColorArrowUP));
                if (SendTelegram)
                    SendMessage(message + "\n" + "Cross Long Signal" + "\n" + EmailBody);
            }
            else if (Short && Fast.HasCrossedBelow(Slow, 0))
            {
                if (PlaySound)
                    Notifications.PlaySound(MediaFile);
                if (SendEmail)
                    Notifications.SendEmail(Sender, Receiver, Subject, EmailBody + " " + message + " " + "Cross Short Signal");
                if (Arrow)
                    Chart.DrawIcon(Bckt ? "Down" + index : "Down", ChartIconType.DownArrow, index, Bars[LastBar - 5].High, Color.FromName(ColorArrowDW));
                if (SendTelegram)
                    SendMessage(message + "\n" + "Cross Short Signal" + "\n" + EmailBody);
            }

        }
        void SendMessage(string s)
        {
            var request = WebRequest.Create(TelgramURL + s);
            request.ContentType = "application/x-www-form-urlencoded";
            request.Method = "POST";
            var response = request.GetResponse();
        }
    }
}

Hi 

This is a simple alert indicator but the popup option is not added in this script, can somebody help me with that, needed a popup script included in the script.