Press the green flag to start the random number generator. Choose your numeric seed and how many numbers you would like. It will say your randomly generated numbers. It does this without the green "Pick random from x to y" block. Then, you can press the space bar to show you how random the numbers were. In general, if this number is less then 0.1, your numbers were created very randomly. This number is not useful for less then 10 randomly generated numbers.
I used the Wikipedia page on pseudo random number generators to do this.
