Look at your Wii remote. Around the bottem of the remote, you should see a button with a one (1) on it. Below that you should see a 2 button. Press the button with the 2 on it once.Do the same with the 1 button. The d-pad is the little cross-shaped thingy toward the top of the Wii Remote. Press the top part (or up part) once. Do the same with the down part, but press it twice. Do the same you did with down, but do it on the left. Then do the same on the right part.
You now know how to enter your cheat code, what buttons to press, and what the d-pad is. Now, go and cheat!