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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.
It was the same for me. I tried it, failed, and hit 'Reset' to try and fail again, so I decided I needed something other than built-in functions here, although it seems that for some, it does work for whatever reason.