How can I change the tire pressure in my Audi A3?

I am having trouble finding where to adjust the tire pressure in my Audi A3. Does anyone know where I can locate it and how to properly change it?

To change the tire pressure in your Audi A3, locate the valve stem on each tire and use a tire pressure gauge to check the current pressure. If it is too low, use an air compressor to add air until it reaches the recommended pressure listed in your Owner's Manual. Remember to check the pressure regularly to ensure safe driving.