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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 don't see a test case that covers this stipulation in the description: "Both elements of the pair must be unique".
A test like this would do it:
SumOfTwoSumTargets(new[] { 4, 6, 10 }, 6, 11);
Where if you picked {4, 4} you'd end up with the wrong sum.