I did not know before. Now, yes.
If you DO have a Wii, then:
1. Go to the Main Wii Menu
2. go check your mail in the bottom right menu.
3. In that menu you're supposed to have two menu buttons to the bottom left of the screen. Pick the right one (because the left one is the calendar and that's not what you want)
4. You have 3 stuff now, pick the rightmost one.
It's a notebook, and your Wii code is written on it.
It's not exactly clear what you're asking for, but I suspect that this section isn't where this thread belongs. Anyhow, here are some other parts of the ZU forums where you can get your question answered if Void Phantom's advice isn't sufficient: