If you bought the trick from here, if you click on the MyPenguinMagic button at the top of this page:
and log in, you'll see a list of the tricks you've bought, along with some buttons to the right of each: "Watch", "Learn" and "Discuss". Click on the "Discuss" button (
) and you'll get into the forum where you can openly discuss things like this. If you are logged in, you can also get access to the forum from the main forum index. All the tricks you have bought from Penguin will have forums lised near the bottom.