Your console must have the Homebrew Channel installed via exploits like LetterBomb or BlueBomb.
A WAD file (which stands for "Where's All the Data") is a package format used by Nintendo for the Wii console. These files contain channels, system updates, hidden operating system protocols (IOS), and digital games. wii wad pack
installed before using any WAD pack, as installing a "bad" WAD can lead to a system brick. Your console must have the Homebrew Channel installed