Donchan EA for Meta Trader 4

I would like to know where is (X1,X2,X3,X4) is so i can do my own edit while not destroying the whole programming. (Recommend //Comment ValueX1, Value X2 for respective Values)

You can input any Valid information for said (X1,X2,X3,X4) 
e.g
X1 = 20
X2 = 1 hour
X3 = 10,000
X4 = to Execute "Long" entry

Broker: IG
you would need knowledge of how to select instrument from "Broker IG"
e.g EUR/USD Mini

Program FOR Metatrader4 ONLY
Donchan Channel(X1) based on timeframe (X2) with trading size (X3)
Donchan Channel upper and lower band triggers entry(X4). 
If new short signal arise during a long trade, it needs to close the said "long" and start a short. (My account allows hedging/Force open) so if i am on a long for e.g 10,000, Going short 20,000 will not neutralize the position.

No SL or Tp needed nor money management calculation. Thanks you.