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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.
This has been raised as an issue already
Should be fixed now.
Andrew seems to be right
Ranks can't be changed and both are whites, no big deal.