When a new vehicle is delivered, there is a folder in the glove box that contains important documentation relating to it. These documents include the warranty, the service booklet, and, most important, the owners's manual for the vehicle.
Six months and about 12.000 miles later, when the driver has a question about the operation of something on the vehicle, the manual has often "grown legs" and is gone. Happily, replacing it is not that difficult.
All vehicles should have an owners's manual in the glove compartment or a door pocket, somewhere where it is easy to access. If it is missing, there are two steps to take to try and obtain a replacement copy.
First, visit the dealer who delivered the vehicle. If it is still the current model, not last year's or the year before, the part department may have one in stock and immediately available.
The next best way to get one is by calling the automaker's customer-relations department number. Sometimes one can be ordered directly from them, but in many cases they will refer you to a company they have subcontracted to print and distribute the owner's manuals. Reprints of manuals can cost anywhere from less than $5 to as much as $100 depending upon the age of the car and the specific manual needed.