1. Wrap 18 inches of floss around your middle fingers. Push the floss through the tight space between two teeth. (This is called the contact)
2. Hook the floss around one tooth in a C shape and slide it under the gum line. Then move it back and forth over the tooth's surface, in a motion smiliar to shining a shoe.
3. Before you pull the floss back through the contact, slide under the neighboring tooth's gum line and repeat the shoe-shining motion.
Viola -- there you have it. Flossing after each meal is recommended but even if you do it before bed that's better than nothing at all. There are also some great products on the market to help you floss with no fuss. Just check out the toothpaste aisle at your local Target or Walmart.