Leaderboard scores

is there a way to delete an user score from the leaderboard with actions?
i made a simple registration system where user insert their name. Than they can send their score to the leaderboard. if a user change his name and send the score again, the previous score stay in the leaderboard, but i want to delete it.
Another thing, is there a way to make the user insert a name that isn’t already used? for example with a variable containing all the used names?

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