Someone could help me to add alert to this indi pls

Hi, I need to add an alert to this indi, it already has one but even if i activate it, it jut sound each 3-5 minutes even if the arrow doesnt appear in the chart, pls i need to make that the alert sound at the same time that the arrow appear in the chart.
Thanks in advance.

The indicator: https://www.mediafire.com/download/zmjtbwcao9ca355/Arrows.mq4

here it is what you wished for:
//=========arrows.mq4=====================
#property copyright 'John campbell'
#property link 'https://www.SaneFX.com'
//signal alert added by skaboy 01/16/2014
#define SIGNAL_BAR 1

#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 Lime
#property indicator_color2 Red

double g_ibuf_76[];
double g_ibuf_80[];
double tSignal[];

int g_period_84 = 1;
int g_period_88 = 10;

//extern bool SoundON = FALSE;
extern bool AlertON = FALSE;

double g_time_96;

int init() {
   SetIndexStyle(0, DRAW_ARROW, EMPTY);
   SetIndexArrow(0, 233);
   SetIndexBuffer(0, g_ibuf_76);
   SetIndexStyle(1, DRAW_ARROW, EMPTY);
   SetIndexArrow(1, 234);
   SetIndexBuffer(1, g_ibuf_80);
   SetIndexBuffer(2, tSignal);
   
   return (0);
}

int deinit() {
   return (0);
}

int start() {
   int li_0;
   double ima_4;
   double ima_12;
   double ima_20;
   double ima_28;
   double ima_36;
   double ima_44;
   double ld_52;
   double ld_60;
   int li_68 = IndicatorCounted();
   if (li_68 < 0) return (-1);
   if (li_68 > 0) li_68--;
   int li_72 = Bars + 1 - li_68;
   for (int li_76 = 0; li_76 <= li_72; li_76++) {
      li_0 = li_76;
      ld_52 = 0;
      ld_60 = 0;
      for (li_0 = li_76; li_0 <= li_76 + 9; li_0++) ld_60 += MathAbs(High[li_0] - Low[li_0]);
      ld_52 = ld_60 / 10.0;
      ima_4 = iMA(NULL, 0, g_period_84, 0, MODE_EMA, PRICE_CLOSE, li_76);
      ima_20 = iMA(NULL, 0, g_period_84, 0, MODE_EMA, PRICE_CLOSE, li_76 + 1);
      ima_36 = iMA(NULL, 0, g_period_84, 0, MODE_EMA, PRICE_CLOSE, li_76 - 1);
      ima_12 = iMA(NULL, 0, g_period_88, 0, MODE_EMA, PRICE_CLOSE, li_76);
      ima_28 = iMA(NULL, 0, g_period_88, 0, MODE_EMA, PRICE_CLOSE, li_76 + 1);
      ima_44 = iMA(NULL, 0, g_period_88, 0, MODE_EMA, PRICE_CLOSE, li_76 - 1);

      tSignal[li_76]= 0;
      if (ima_4 > ima_12 && ima_20 < ima_28 && ima_36 > ima_44)
               { g_ibuf_76[li_76] = Low[li_76] - ld_52 / 2.0;
                tSignal[li_76]= 1;}
      else
         if (ima_4 < ima_12 && ima_20 > ima_28 && ima_36 < ima_44)
               { g_ibuf_80[li_76] = High[li_76] + ld_52 / 2.0;
                tSignal[li_76]= 1;}
/*
      if (ima_4 > ima_12 && ima_20 < ima_28 && ima_36 > ima_44) {
         g_ibuf_76[li_76] = Low[li_76] - ld_52 / 2.0;
         if (SoundON == TRUE && g_time_96 != Time[0]) {
            Alert('SaneFxBinary Buy Trade ', Symbol(), Period());
            g_time_96 = Time[0];
         }
         
      } else {
         if (ima_4 < ima_12 && ima_20 > ima_28 && ima_36 < ima_44) {
            g_ibuf_80[li_76] = High[li_76] + ld_52 / 2.0;
            if (SoundON == TRUE && g_time_96 != Time[0]) {
               Alert('SaneFxBinary Sell Trade ', Symbol(), Period());
               g_time_96 = Time[0];
            }
         }
      }
*/
   }
   //----Sound Alert section for MLQ4 article
   //---- Static variables where the last bar time
   //---- and the last alert direction are stored
   static int PrevSignal = 0, PrevTime = 0;
 
   //---- If the bar selected to be analyzed is not a zero bar,
   // there is no sense to check the alert
   //---- several times. If no new bar starts to be formed, quit.
   if(SIGNAL_BAR > 0 && Time[0] <= PrevTime )
        return(0);
    //---- Mark that this bar was checked
    PrevTime = Time[0]; if(PrevSignal <= 0)
      {
        if(tSignal[SIGNAL_BAR] > 0)
          {
            PrevSignal = 1;
            if (AlertON) Alert('SaneFxBinary Buy Trade ', Symbol(), Period());
          }
      }
    if(PrevSignal >= 0)
      {
        if(tSignal[SIGNAL_BAR] < 0)
          {
            PrevSignal = -1;
            if (AlertON) Alert('SaneFxBinary Sell Trade ', Symbol(), Period());
          }
      }
   //-- end Alert
   return (0);
}
//=================================

oops...sorry for the error
please change this
'''''
tSignal[li_76]= 0;
      if (ima_4 > ima_12 && ima_20 < ima_28 && ima_36 > ima_44)
               { g_ibuf_76[li_76] = Low[li_76] - ld_52 / 2.0;
                tSignal[li_76]= 1;}
      else
         if (ima_4 < ima_12 && ima_20 > ima_28 && ima_36 < ima_44)
               { g_ibuf_80[li_76] = High[li_76] + ld_52 / 2.0;
                tSignal[li_76]= 1;}
====

to

=====
tSignal[li_76]= 0;
      if (ima_4 > ima_12 && ima_20 < ima_28 && ima_36 > ima_44)
               { g_ibuf_76[li_76] = Low[li_76] - ld_52 / 2.0;
                tSignal[li_76]= 1;}
      else
         if (ima_4 < ima_12 && ima_20 > ima_28 && ima_36 < ima_44)
               { g_ibuf_80[li_76] = High[li_76] + ld_52 / 2.0;
                tSignal[li_76]= -1;}
========
just copy and paste.
the error is in the sign of tSignal[li_76] in the lst lnie. it should read tSignal[li_76]=-1

ok