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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Exactly my feeling, there must be something that I don't know that I don't know! I'm not even able too come up with a sensible google query for this one!
The description of what constitutes a valid email could be more clear. What are "word characters" as opposed to "letter characters"? Providing more test cases would also have been useful.