The second element for making the game happen is to write a set of instructions for players to follow when playing the game. If you have any games at home, read the instructions that came with the game. You can also find directions for playing games online, read these instructions and use them as models for your own instructions. Type up the instructions once they are written and package them with the other elements that your group have created for your game.
Now all that is left to do is play the game!