Basically, the whole point is a person has to wish for something, and the next person to read it has to post a "corrupted" version of the original post. Then they make a wish, and the list goes on and on
For example:
P1: "I wish I could have a cake for dinner"
P2: "Granted, but it turns into poo cake"
"I wish for a new house"
And so on...
If you still don't get the idea, just go look up "Corrupt a wish" on Google or something

Let me start off,
I wish for an Assassins Creed 3