You can use mouse to click on the cell table to choose the first generation. Once you choose a specific cell, you can also click again to cancel that population of cell.
Then just click on the start the program will begin to generate the next generation base on the rules of the life.Each generation of the cell will have different color, that means, user can identify the number of generation of a cell base on its color. The generation of the color is as follow:
The Life source code