And it creates moral knowledge by conjecture and refutation, same as any other knowledge. If you understand how Popper approaches any kind of knowledge (which I have written about a bunch here), then you know how he approaches moral knowledge too.

Consider that you are replying to a statement I just said that all you've done is say that it would use the same methodologies. Given that, does this reply seem sufficient? Do I need to repeat my request for a worked example (which is not included in your link)?