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First, to obtain a Friend Code, you must connect Online once for each Wi-Fi Game you have. Once done, you will recieve a Friend Code. To find it, go to the Nintendo WFC Menu. From there, go to Add/Edit Friends. ook for either Confirm Friend Code or Add Friend (Depending on which Game it is. Mario Kart, for example, will have your Friend Code under Confirm Friend Code). You'll notice two rows of random numbers. This is your Friend Code. You will need this to give to your friends and vise versa. Once you and your friend have each others codes, connect online again. You should be able to challenge him to races now.