Press space to start sorting the numbers. Press C to toggle custom mode on/off, and press D to revert to default settings. To get a new random set, just hit the green flag again. If you simply want to rearrange the numbers, press R. The program will attempt to sort the list until the numbers are in ascending order. I do not recommend going above 6 numbers if you want to see the program finish.
What is bogosort? Bogosort is a very inefficient sorting method. What it does is that it randomises the list of numbers, and tests if it is fully sorted. If not, it will randomise the list of numbers again. It usually takes a very long time so it is only used for educational purposes.