You can either wait a couple minutes and try again, or inform your friend of the problem.
first go to Mario kart channel in the game.then go down to the last selection and it will tell you if you want Mario kart channel.press A and then wait a few minutes and you will get Mario kart channel.
go to the Mario kart channel and hit tournament
You go to Mario Kart channel and click on Tournaments.
Go to Youtube.com they have friend code videos for Mario Kart Wii.
With the Homebrew channel.
You have to have owned your Mario kart wii game for over a year and then it will automatically be on your console.
You need the Mario Kart Channel. Then challenges come rapidly.
Mario
On the load game screen go to the options menu in the top right corner, it is one of the three options there. You can also Download it from the Mario Kart Chanel VIA the game. In the Channel, the bottom of the sceen should either say Download Mario Kart Channel or Recieve Mario Kart messages. Either way this will lead you to several options one of them is to Download the Channel.
sure
yes, but you must first subscribe to the Mario kart channel
i don't think you can only if your friend has Mario kart ds