Create another Variable like this just below the ADXPeriod

extern int DIPeriod = 5;

Now go to the following lines:

PlusDiBuffer[i]=iMAOnArray(PlusSdiBuffer,Bars,ADXPeriod,0,MODE_EM A,i);
and
MinusDiBuffer[i]=iMAOnArray(MinusSdiBuffer,Bars,ADXPeriod,0,MODE_E MA,i);

change ADXPeriod to DIPeriod.

Hope this helps.
Maji