Hello Rubia, Your question: "How do I say: How do I use...?" (in Japanese). OK, here is a quick and easy answer for you. どうやって使いますか 「どうやってつかいますか」ー＞（dou yatte tsukaimasu ka?） どう = How やって = Do 使います = Use か = marks it as a question So if you wanted to say: "How do I use this?" Just say: これをどうやって使いますか Cool? Got it? Rock On!