Well, I don't know how much more specific it could get.
1. Get the link to your game.
2. In the post of mine that has the code, click select.
3. Now, in the reply section, paste your url of the game into the area that says insert game link here. Take out the words insert game link here.
Now, between the http://
area, type in the word you want. Mine says Nightmare.
And yes, please say what you're confused on.