buttons on the console front, right.
The Hackmii installer is very pickie and the results scatter when using different cards.
Heard people saying it works with sdhc but i won't trust on that. more complains come from users with SDHC or mini/micro cards in an adapter.
use a 2GB SD card and everything should be fine (brand: sandisk has the highest success rate, an official/nintendo wii card for example)