You can open the gas tank on your 2015 Toyota Camry by pulling the gas tank lever, which will be located on the left-hand side floor just in front of the driver’s seat. It should be right above the “open trunk” lever.
Once you pull the lever, your gas tank cover should pop right open. Then, you can simply unscrew the gas cap and add fuel to the tank. Replace the gas cap by screwing it on in a clockwise direction, and press the door to shut and seal it.