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^disregard this don't tell her you like her. Remember cat string theory is she knows you like her she won't want you. Act like you don't want her- she disgusts you. That'll make her claw at you for more.
^disregard this, he doesn't know what the fuck he's talking about, and this is a great way to never get laid. Ever.
There's nothing special you need to say or do. Get close to her while you speak to her. If she doesn't move back and she's comfortable with your faces close go for the kiss.
If she moves her head back, don't. If she just turns her cheek when you kiss her, it's not a rejection. Grab her face, turn her around and kiss her properly. Imagine if it was a gay guy trying to kiss you, you wouldn't turn your cheek, you'd move your head back right? That's how you tell the difference between her not being interested or just playing hard to get.
That's all you really need to know about kissing. You just have to grow some balls and go for it when you want.