Help adding push notification, to my source file

Hey guys i need help adding push notification to my source file 

I know i declared it correctly using extern bool   Push_Notification = true;

 and using this snippet here

if (alertsEmail)   Push_Notification();   

 Here is the source code 

//---- indicator settings

#property  indicator_separate_window

#property  indicator_buffers 4

#property  indicator_color1  Lime    //FPK_MACD up

#property  indicator_color2  Magenta //FPK_MACD up

#property  indicator_color3  Yellow    //Upperband

#property  indicator_color4  Yellow     //Lowerband

extern int FastLen = 12;

extern int SlowLen = 26;

extern int Length = 10;

extern int barsCount = 400;

extern double StDv = 2.5;

extern double buff = 0.1;

extern bool alertsOn             = true;

extern bool alertsMessageBox     = true;

extern bool alertsSound          = false;

extern string alertsSoundFile    = "TP1M.wav";  //enterSoundFile

extern bool alertsEmail          = false;

extern bool alertsAfterBarClose  = true;

extern bool   Push_Notification = true;

//----

int loopbegin;

int shift;

double zeroline;

//---- indicator buffers

double ExtMapBuffer1[];  // FPK_MACD

double ExtMapBuffer2[];  // FPK_MACD

double ExtMapBuffer3[];  // Upperband Line

double ExtMapBuffer4[];  // Lowerband Line

//---- buffers

double bbMacd[];

double Upperband[];

double Lowerband[];

double avg[];

double bbMacdline;

double sDev;

double mean;

double sumSqr;

double sslHup[];

double sslHdn[];

double hlv[];

double hlv2[];

double sslHup1[];

double sslHdn1[];

double hlv1[];

int levdr = 0;

double alertTag;

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int init()

  {

//---- 6 additional buffers are used for counting.

   IndicatorBuffers(8);   

//---- drawing settings     

   SetIndexBuffer(0, ExtMapBuffer1); // FPK_MACD line

   SetIndexStyle(0, DRAW_ARROW);

   SetIndexArrow(0, 108);

   IndicatorDigits(Digits + 1);

//----

   SetIndexBuffer(1, ExtMapBuffer2); // FPK_MACD line

   SetIndexStyle(1, DRAW_ARROW);

   SetIndexArrow(1, 108);

   IndicatorDigits(Digits + 1);

//----   

   SetIndexBuffer (2,sslHup1); SetIndexStyle(2,DRAW_ARROW); SetIndexArrow(2,108); SetIndexLabel(2,"cross");

   SetIndexBuffer(4, bbMacd);

   SetIndexBuffer(5, hlv1);        

   SetIndexBuffer(6, Lowerband);

   SetIndexBuffer(7, avg);    

//---- name for DataWindow and indicator subwindow label

   IndicatorShortName("FPK_MACD(" + FastLen + "," + SlowLen + "," + Length+")");

   SetIndexLabel(0, "bbMacd");

   SetIndexLabel(1, "Upperband");

   SetIndexLabel(2, "Lowerband");  

//---- initialization done

   Comment("Copyright © http://www.forexprofitkeeper.com");

   return(0);

  }

//+------------------------------------------------------------------+

//| Custor indicator deinitialization function                       |

//+------------------------------------------------------------------+

int deinit()

  {

//----

   return(0);

  }

//+------------------------------------------------------------------+

//| Custom FPK_MACD                                                   |

//+------------------------------------------------------------------+

int start()

  {

   int limit;

   int counted_bars = IndicatorCounted();

   if(counted_bars < 0) return(-1);

   if(counted_bars > 0) counted_bars--;

      if (barsCount > 0)

            limit = MathMin(Bars - counted_bars,barsCount);

      else  limit = Bars - counted_bars;

//----

   for(int i = 0; i < limit; i++)

       bbMacd[i] = iMA(NULL, 0, FastLen, 0, MODE_EMA, PRICE_CLOSE, i) - 

                   iMA(NULL, 0, SlowLen, 0, MODE_EMA, PRICE_CLOSE, i);

         sslHup1[i] = iCustom(NULL,levdr,"",0, 3,i);                                 

         sslHdn1[i] = iCustom(NULL,levdr,"", 0, 4,i);

//----

   for(i = 0; i < limit; i++)

     {

       avg[i] = iMAOnArray(bbMacd, 0, Length, 0, MODE_EMA, i);

       sDev   = iStdDevOnArray(bbMacd, 0, Length, MODE_EMA, 0, i);  

       ExtMapBuffer1[i]=bbMacd[i];     // Uptrend FPK_MACD

       ExtMapBuffer2[i]=bbMacd[i];     // downtrend FPK_MACD

       //----

       if(bbMacd[i] > 0)

           ExtMapBuffer2[i] = EMPTY_VALUE;

       //----

       if(bbMacd[i] < 0)

           ExtMapBuffer1[i] = EMPTY_VALUE;

         if (alertsOn==true && i==1 && bbMacd[i] > 0 && bbMacd[i+1] < 0 && alertTag!=Time[0])

         {

       Alert("FPK_MACD crossing O on the upside on ",Symbol()," ",Period());

       alertTag = Time[0];

     }

     if (alertsOn==true && i==1 && bbMacd[i] < 0 && bbMacd[i+1] > 0 && alertTag!=Time[0]){

       Alert("FPK_MACD crossing O on the downside on ",Symbol()," ",Period());

       alertTag = Time[0];

         }    

         sslHup1[i] = EMPTY_VALUE;

         }

   for(i=limit;i>=0;i--)

    {

      if((bbMacd[i+2] < 0 && bbMacd[i+1]>buff*Point) || (bbMacd[i+2] > 0 && bbMacd[i+1]<-buff*Point) || (bbMacd[i+2] < buff*Point && bbMacd[i+1]>buff*Point) || (bbMacd[i+2] > -buff*Point && bbMacd[i+1]<-buff*Point))  hlv1[i] =  1;

      else   hlv1[i] = - 1;

          if(hlv1[i] == -1) { sslHup1[i] = EMPTY_VALUE;  }

          if(hlv1[i] == 1)   {  sslHup1[i+1] = levdr; } 

          if(bbMacd[i+2] < 0 && bbMacd[i+1]>buff*Point) hlv[i] =  1;

          if(bbMacd[i+2] > 0 && bbMacd[i+1]<-buff*Point) hlv2[i] = 1;

}

//---- done

   return(0);

  }