Z button doesn't work in Mario Galaxy

[blzd1]

I can't ground pound, or whatever it's called, in Mario Galaxy. I press the key on my computer keyboard (B) mapped to the Z button, but for some reason, this does the exact same thing as the keys mapped to X and Y, the bash or whatever. In fact X,Y,Z do all the same thing. I therefore can't ground pound and get stuck. I'm using dolphin 4.0 if that matters. Any suggestions?

[ExtremeDude2]

Are you mixing it up with shake? You should configure it in the extension area, not under wiimote.

[blzd1]

Are you mixing it up with shake? You should configure it in the extension area, not under wiimote.

Yeah, I configured the keyboard in the wiimote area with shake. Where is this extension area you refer to?

Edit: Nevermind, I think I understand where it is now, although I'm still a bit confused by the controls overall.