Hi please tell me how to apply powder blush?

I am seventeen years old and I have an upcoming prom night where I want to look my best. Actually I want to impress my crush at the event who has asked me to go out with him. My sister said that I should put on good make up, as it is make up that can hide our flaws and make us look beautiful and gorgeous. I have no knowledge of how to apply powder blush? So please help me out…