If the light remains on *after* you've properly inflated all tires and driven a short distance, there are a few possibilities:
* Faulty Tire Pressure Sensor: One or more of your tire pressure sensors may be malfunctioning. This requires a trip to a mechanic or tire shop to diagnose and potentially replace the faulty sensor(s).
* Low Battery in Sensor: The sensors themselves have small batteries that can eventually die. Replacement is necessary.
* Wiring Problem: A problem with the wiring to the sensors is possible, though less common. Again, a mechanic will need to diagnose this.
* Incorrect Tire Pressure: Double and triple check your tire pressures using a reliable gauge. Make sure they match the sticker on your driver's side doorjamb or your owner's manual.
In short: There's no manual reset button. Inflate your tires, drive a bit, and if the light stays on, you'll need professional help to diagnose the issue.