You might not have filled the tires with enough air to reset the light.
Try filling all tires to about 40psi, then start the car and drive once around your neighborhood. Once back at your house, reduce the air pressures back to manufacturer's recommendations (listed in the door jamb) before you drive around again. That should reset the light.
If the above doesn't reset the light, there's likely a problem with your tire-pressure-monitoring system or with one of the in-wheel sensors.
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