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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.
I think it is necessary to credit problems you are sourcing from other locations.
There are quite a few katas on here that word for word are taken out of various programming contests where the original problem writes spend MONTHS writing the problems, generating multiple solutions in multiple languages, running through performance analysis and their hard work was not credited.
It only takes one line to quickly state where you are adapting these problems from.
I would do it in the Description. Jut be carefull the source does not reveal too many clues (or the complete solution ;-)
The description is, by large, a normal html fragment so you can add references the usual way.