The method for installing homebrew is somewhat different depending on the operating system of your Wii.
To find out what version of the operating system you have, go to Wii Options, click on "Wii Settings" and check the number on the upper right corner of that screen. If you have 4.2 or lower you will use something called Bannerbomb. Note: If you have a brand new Wii, this reportedly won't work until there is at least one message in your message board.
Future Wii updates to the Wii may kill your Homebrew Channel (or even brick your Wii), so you shouldn't update your system after installing homebrew.
You can check the version of your Wii console by looking at the numbers on the top right corner on page 1 of the Wii System Settings page.Wii System Update 4.0Feature additions on your Wii console when it is updated to version 4.0: SD Memory Card Functionality The SD Memory Card functionality of the Wii console has been enhanced to support the following features: Please note that at the time the Wii System Update 4.0 was released, Nintendo made available an updated version of the Wii Speak Channel that supported the SDHC Memory Card format.If the main version doesn't work for you, go back and try the others one by one until you find one that works on your Wii. 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.However, the Wii Speak Channel is no longer available for download from the Wii Shop Channel, and it cannot be transferred to Wii U.
Wii Shop Channel Important: Save files created by unauthorised modifications may cause damage to your Wii console.This Wii Menu update will detect and automatically delete such files.Please note that these deletion measures will not affect Wii consoles that contain only normal save files.There is no guarantee that using homebrew software will not harm your Wii.does not take any responsibility for any problems arising out of installing homebrew. It is also possible that installing homebrew could void your warranty.Wii System Update 3.1Feature additions on your Wii console when it is updated to version 3.1: You can now use a USB keyboard with your Wii.