@wahabdeen2 your better of using ninjatrader futures data to use Kiss order flow with its 6E,6B symbols or Rithmic but i you want to use it on Forex ,you need an FXCM account,open a live if you can or demo account its easier and free and reach out to live support its usually at the bottom of the page and tell them to remove hedging from your account to be able to use it on Ninja trader 8,Fxcm usually provides in candle date that can be used to read order flow other forex brokers dont provide in candle data
Best of luck