I presume that you are having problem in building the
B-While Loop in "Building Arrays.vi"
And, I also assume that you didn't manage to get the random number output as an 1D array.
Steps:
1. Place the Random Number function in the while loop
2. Wire its output to the while loop
3. Right-click on the Intersection where the Random Number's output joins the while loop and Select "Enable Indexing"
4. Wire it to the Numerical Array Indicator
Hope this is what you are looking for.
regards