Account scamming and how to report it

How do I report potential scammers here on league of legends because there is a guy that goes around and says that he can help you boost your account to either silver or gold, the catch is that he says that he does this by playing on your account and that he will need your account and password to access it and that I will not need to worry about him stealing my account because nowadays they require your email to steal it he also includes that the price for this is either I have to buy him a 1350RP skin or I must wire 10 euros into his account via paypal. Now I'm not stupid I can see a hassle from a solar system away but is there a way to report this guy before he scams someone else that does not see the trap so easily?

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