go to your local pharmacy. there are over the counter shampoos for this.
just go to the drug store and spend around $8 to buy human flea shampoo and follow the directions on the label. i'd also suggest that you take a few extra products while you're there and use them around your home to get rid of the fleas.
if you have animals in your home, you should buy them a pill that last 3 months for fleas and ticks. 