Jacy
Now with less viruses
From what I heard of youtube, it is a feature that doesn´t work, there´s no way to use it, sorry.
I found out how. you have to go into the wonder card and press "A" and find a "Send" option. I think you need a certain amount of friends for it to work though, and you can only give away a certain card a certain amount of download times. (Secret key can be downloaded by 4 people 5 separate times making a total of 20 people getting the card.)