Because vibrators are often penis-shaped many girls think they have to insert the vibrator in their vagina. But this is disappointing for most of them since the vagina itself is not very sensitive.
Most girls press the vibrator against their clitoris. Other areas you can stimulate with the vibrator are the clitoral hood, the skin at the sides of the clitoris, the labia and the vaginal opening. With vibrators made of plastic you can assert pressure on your clitoris, which can be nice. But vibrators made of softer material feel more like human skin, which can also be a turn on.
Experiment. Vary the amount of pressure, pressing against your clitoris or stroking it, direct stimulation of your clitoris or indirect by pressing it against the surrounding area. By trying different things you’ll find out what works best for you.
If the vibrator has the shape of a dildo, you can also thrust it in and out of your vagina. But for most girls this is not their favourite.
Girls who have a hard time climaxing can benefit from using a vibrator. Because the clitoral stimulation is quite intense, it’s easier to orgasm with a vibrator than using fingers.