The transmission dipstick is usually located next to the transmission in a housing tube, and it has marks on it indicating where the fluid levels should be. Find the transmission dipstick, and check it regularly, with tips from an auto repair shop manager in this free video on car maintenance.
The transmission dipstick is critical to the transmission to allow you to monitor the fluid level. In this particular car it would be near the transmission, and have the long tube which is located right here. This your transmission dipstick tube, which houses the dipstick. Once you remove the transmission dipstick, you will notice that it has gradual marks on it indicating where the fluid level should be located at. Then reinstall the dipstick in the tube.