How do I get my EA to trade mutliple currencies

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This EA is currently optimized for the GBPUSD 4hr chart but I would like it to work on multiple currencies, could some exam the logic and explain to me where I am going wrong. I am having a hard time understanding the MarketInfo function. I would like the final EA to only take one order at a time per currency.

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...
line6:           int digits              =  MarketInfo(Symbol(),MODE_DIGITS);         
...
line14:         ticket=OrderSend(Symbol(),OP_BUYSTOP,Lots, buy_price,3,0,buy_take_profit,"--",magic,TimeCurrent()+4*60*60,White);
...
line20:         ticket = OrderSend(Symbol(),OP_SELLSTOP,Lots,sell_price,3,0,sell_take_profit,"--",magic,TimeCurrent()+4*60*60,Red);
...

This expert is not programmed to take multiple currencies. 
The argument 'Symbol()' is telling the functions to use the symbol from the chart the expert is attached to: the current chart. 
You must change this arguments if you want it to trade multiple currencies. 
I suggest introducing channels into the code to keep track of multiple symbols. However, channels are not the only way.

[Joao Rosas]

open a chart to each currency; attach the EA to each chart.