Instructions
Download Bannerbomb version 1 from the Bannerbomb website. Open the downloaded file and place its contents on an SD memory card.
Download the HackMii installer from the same location, rename the installer.elf file to boot.elf and place it on the SD memory card.
Insert the SD card into the Wii console. Go to the Data Management section of the Wii option menu and click the SD card icon. The Multi-Mod Manager should load.
Select WAD manager and press A on the Wii remote. Press 1 and then A to install all WADs. These will allow you to install the Homebrew software on your Wii.
Press 2 to load the app manager. Select Hackmii installer and press A to load it.
Press 1 after the Bootmii software loads to begin installing the Homebrew Channel. Press the home button after it installs to go to the Homebrew Channel menu. Here you can find the Homebrew browser with which you can look through and download user-created applications. The Homebrew Channel will also be installed on the main channel screen of your Wii.