"Learning Android, 2nd edition - unable to register at http://yamba.marakana.com/

Hi there :) I've just bought the "Learning Android, 2nd edition" and to work on the tutorial which is the entire book about, I need to register at http://yamba.marakana.com/. But I'm not able to make any account. Because it says it's only for invited users. I've also found a text that says, that I have to invite myself as a student, but I don't know how to do that. Thanks in advance
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