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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.
You have your browser's history for that. Also, you can visit your profile to see "unfinished" katas list.
Focus on learning fundamentals to solve simpler problems, and in a week, you'll likely be able to come back and solve this one (and many more) too.
Pick an easier kata? There's plenty of 8/7 kyu katas for you to practice to help you level up and tackle this one (later).