Joystick Mapping Issues

I"m having allot of issues with the Input Contols. I'm able to use the gamecube pad and the Wiimote but the problem arises when I play Super MArio Galaxy, and it states I need to use a nunchuck. I have alot of issues with this.I have no idea what they mean by swing,tilt and shake so I can't map it out.I have a Saitek P990.I'm trying to break some crystals on Super Mario Galaxy.I'm so lost.I have used all the nintendo emulators with no problem but this one has me very frustrated.

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