Using a car sun shade is very simple. First you need to take out the rubber bands that keep it rolled up so you can unfold it. Once the car sunshade is open, it is placed on the inside of the front window of the car. Some types of sunshades have suction cups that allow them to be attached to the glass so that they do not fall out. They can also be attached to the visors at the top of the car and even by holding the sun visor rubber to the windows.