How to find HIGH HELP!

Have you looked into the editor's reference?

Taken from there:

for(x=1;x<=7000; x++) 
  { 
   if(IsStopped()) 
      break; 
   Print(MathPower(x,2)); 
  } 

Now amending that:

int noH = 9; // Hours = Bars
double hiHi=High[0],loLo=Low[0]; // ini vars => 1st bar, 1st hour
for(x=1;x<noH; x++) { // loop 8 times
   hiHi = fmax(hiHi,High[x]); // if you are on a h1-chart, otherwise you have to use iHigh() and iLow()
   loLo = fmin(loLo, Low[x]);
}