Hello Xiaofeiyu, I don´t know if I understand your questions very well but I will try to answer your the better that I can...please read becareful:
1) you can modify everything, and all the pairs, I recommend you not change all the parameters, only choose the right pairs, this is the most important thing; also you must set the TP, TP2, Average, Global Take Profit, and Global Stop Lose like USD (or the account currency).
Barras Base is the large period, from this period the EA take the info, and the Barras Actual is the actual period, for example: if you choose "PeriodoBase= 1 hour" and "BarrasBase = 240" that mean that the EA will calculate the correlation from 240 hours; if you choose "PeriodoActual = 1 hour" and "BarrasActual= 24" the EA will compare the correlation in 240 hours (Base) with the correlation of 1 day (24 hours) of the actual correlation.
In MT4 you can only test it in forward test, that is the reason because I make the MT5 version to test it in backtest and find the best pairs set.
2) I will upload one of the last set files, I don´t know if it is the set that you ask but is a good set to start, you must study and test others sets please.
3) ok, do you use MT4 or MT5 version? the MT4 version is "myoverlay" and the MT5 is only "overlay"; I recommend you not active the overlay feature in the set file or in the EA´s set, is not very good feature in the set but it help very much for the internal work of the EA to know if the price is up or down.
4) If you use 500 usd and you want only 0.01 for start lot you must set:
Start Lots 0.01 and in "Stake" you must put 500.
Regards