This might help it is a very basic way of putting an arrow onto the chart using Wingdings

string MA_Signal="";
color ma_color;

double price = NormalizeDouble(MarketInfo(Symbol(),9),Digits);
double MA = iMA(Symbol(),0,15,0,1,0,0);

if(MA>price){MA_Signal="ê";ma_color =Red;}
if(MA<price){MA_Signal="é";ma_color =Lime;}


ObjectDelete("Arrow");
ObjectCreate("Arrow", OBJ_LABEL, 0, 0, 0);
ObjectSetText("Arrow",MA_Signal, 80, "Wingdings", ma_color );
ObjectSet("Arrow", OBJPROP_CORNER, 1);
ObjectSet("Arrow", OBJPROP_XDISTANCE, 20);
ObjectSet("Arrow", OBJPROP_YDISTANCE, 40 );

Here is an example indicator with this code in it and another indicator fanSimple which shows the use of the numbered Arrow code ie 233 234 etc

cja

Arrow Wingdings.mq4

fanSimple8-1a_NEW.mq4