The pack you need is the one you originally used to Load MMM and the hackmii installer. If you have bootmii installed as boot2 and you extracted that pack to your SD card, if you boot the wii with the SD card inserted then MMM will load.
Does the drive light flash twice quickly when you turn it on? How old is this Wii?
EDIT: and don't COPY the files to your SD card. Do like the guide says and extract the zip file to your SD root.