We’ll go over two of the methods that will likely work for the vast majority of smashers, but if you want to try one of the other methods, the other methods are described on this wiki:
However, there are plenty of ways to install it, so you’ll likely be able to install it no matter what your situation is. As the Homebrew Channel is not officially sanctioned by Nintendo, you can’t just download it from the Nintendo e-shop.
If you want to run SD Remix on a Wii, you will need the Homebrew Channel installed on your Wii.