How can I tell her I like her?

Just talk to her and get to b her friend. Then after a while just tell her you like her.

Ohhhhh, I had the biggest crush on this choir girl when in high school!
she never spoke to anybody. Anyway, what I did was just went up and talked to her every time, like I knew her for ages; and also, I bugged her with simple stuff like, 'i see you're so talkative today. Why don't you tell me how your day went since you wanna tell the whole world. ' I think at first she thought I was crazy, but I did such things regularly, and eventually, we ended up hanging out.
so anyway, how come you never see her after class? What about before class? Or as class ends, what about chasing her? That's what I did, as she would leave class, I ran after her, and I would say, 'you must love your next class as you seem to be so eager to get there. '
You just have to be ready to make conversation and make her laugh some. Oh, once I started talking to her, then I would say, 'so I saw you looking at me in class. ' Her blushing betrayed her, and I would even pick on that. I don't know what personality you have but if you can do something similar, I think you'll be fine.