How do you turn off the check tire pressure light

Fill all 4 tires to the recommended pressure and drive the car. The light will go out after a few minutes. If it stays on, you have a bad tire sensor. You can replace all four, or pay someone to figure out which one is bad. In either case, the sensor needs to be 'synched' to the car after installation. Some aftermarket sensors aren't 'factory' original, so you will need to do all four or the system will never work right.