How do you get of with a girl?

Well this depends on what situation you are in....

Does she know you?

Are you close friends?

If your close friends she may want to keep it that way...

But she might have the biggest crush on you and you dont even know it...

if you flirt a lot ask her out...

Dont talk to much about yourself and make her feel that your interested in what she has to say...

be kind to her and she might be a keeper.