STEPS :
1. Make brief eye contact. Don't stare, and don't avoid eye contact. When your eyes meet hers, hold that contact steadily for a second or two, maybe throw in a grin or a smile if it feels right, and look away and continue with your business. Something as simple as that can show a girl that you're both confident and interested.
2. Make people laugh. Girls love guys who have a good sense of humor, and the key to having a good sense of humor is to be lighthearted, and unabashedly yourself. As long as you're not making fun of people in a mean-spirited way, anything goes. Is your sense of humor perverted? Slapstick? Sarcastic? Go with it, and don't worry about whether or not she thinks you're funny because you know what? If she can't laugh with you, then this isn't a girl you want to spend a lot of time with anyway. And who knows? Maybe another girl—one whom you hadn't noticed before—will be laughing so hard that her soda comes out of her nose, and maybe you've just found your soulmate.
3. March to the beat of your own drummer. It's hard to grab anyone's attention when you look and act like everyone else. Do your own thing, whether that means standing up for yourself, defending someone else, or taking interest in something that no one else does, like playing an instrument or dancing when no one else will. The coolest people are the ones who break against the tide and make people question the status quo.
4. Act confident. Even if you're not very confident, you can still pretend that you are, and sometimes the positive results that you get from acting confident will help you build true confidence. The main thing is that you don't want to come off as needy, as if embarrassing yourself in front of her is the most devastating thing that could possibly happen to you. If you're scared of screwing up, it will show in your body language and most girls can pick up on it. So act fearless. Remind yourself that even if you say the wrong thing, who cares? You can laugh it off, and there are other fish in the sea. This kind of attitude will change the way you carry yourself, and that can grab a lot of girls' attention!
5. Help someone. It could be her, or it could be someone else in the room. Is she carrying something heavy? Say "let me help you with that" and carry it for her. Is someone short on cash? Lend them a few dollars so they can eat lunch. Hold the door open for the next person coming through, even if they haven't reached it yet. In other words, be a kind and generous person. Not only will it get her attention, but it will also make you feel good about yourself. Don't be fake and do nice things only when she's around, though. Help people all the time, in a wide variety of ways. She'll notice, and so will the people she knows, and on the occasion that you come up in a conversation, people will say "He's such a great person!" and this girl will start thinking "Yeah...he is, isn't he?"
