Answer:
Um... well there are a few ways to go about it, it just depends on the person and how you feel is the right way. You could write a note, or text them, saying simply "I like you" or you could give them an entire emotional spill. You could sit down with them and talk to them about it. And depending on the person, they might want to know why you like them, maybe even a simple reason, like their smile brightens the room. As cheesy as all that sounds, I hope at least some of it helps :)