Display an indicator

[ket314MQL4]

Hello,

I am learning to code in mql5 and I would like to know how to display the indicators on the graph? And how to remove the Moving Average indicator (20) when I test.

int BolBandsHandle;              

int OnInit()
  {

  BolBandsHandle = iBands(NULL,PERIOD_H4,20,0,2,PRICE_CLOSE);
  ChartIndicatorAdd(NULL, 0, BolBandsHandle);
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---
   
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {

   
  }
//+------------------------------------------------------------------+