Note: read all onscreen instructions carefully! The programmers could change them at any time.
You will see a loading screen, followed by a black screen with white text telling you to demand your money back if you paid for this software. After a few seconds you will be told to press the "1" button on your remote, so do so.
At this point you’ll be using the direction pad on the Wii remote to highlight items and pushing the A button to select them.
A screen will come up telling you whether the homebrew items you want to install can be installed. This guide assumes they can be. (If you have an older Wii and are using the Letterbomb method then you may be given a choice between installing BootMii as boot2 or IOS. The Readme file included with Letterbomb explains the pros and cons, but newer consoles will only allow the IOS method.)
Select “continue” and press A.
You will see a menu that will allow you to install The Homebrew Channel. It will also let you choose to run Bootmii, the installer, which you will probably never need to do. If you are using the Bannerbomb method you will have a DVDx option as well. Select “Install the Homebrew Channel” and press A. You will be asked whether you want to install it, so choose continue and press A again.
After it installs, which should just take a few seconds, press the A button to continue.
If you're using Bannerbomb you can also optionally use the same procedure to install DVDx, which unlocks the ability of the Wii to be used as a DVD player (if you install media playing software like MPlayer CE). I don't know why DVDx isn't included in Letterbomb, but it can be installed; you can find it with the Homebrew Browser.
When you’ve installed everything you want to install, select “Exit” and press the A button.
After you exit, you will see an indicator that your SD card is loading and then you’ll be in the homebrew channel. If you have also copied some homebrew applications into the apps folder of your SD card then these apps will be listed, otherwise you will just have a screen with bubbles floating on it. Pressing the home button on the remote will bring up a menu; choose exit and you will be in the main Wii menu, where the Homebrew Channel will now be displayed as one of your channels.