The person starting the game has to tell "in the post" the whole object of the game so everyone can understand it. They have to start out the game and say what the next poster can do in playing the game and so on.
For example: the game could be totally about the Chiefs in a kinda broad way.
The starting word is football
The next poster has to give a word starting with the last letter of football. Maybe a player's last name or something about Chiefs football starting with "L".
The third poster has to give a word starting with the last letter of the word that the second poster gave.
And so on....