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Go To expert Section and Click on new 

go to symbol  add new  write name Buy select buy arrow with green colour and  put  this formula    Cross(C,SAR(.006,.2))  


again click on symbol add new write name sell select sell arrow with red colour  and put this formula    Cross(SAR(.006,.2),C)

write name of expert and save now applicable this on chart and select time period which you suit to trade i.e. 5 min, 10 min and enjoy good buy sell arrow