Should turn off automatically as long as the tire is inflated and they didn't damage the sensor on the wheel in the process of removing/replacing the tire. if they damaged the sensor and replaced it, then you would need to reset the system with the special unit.
Two things make the light come on - Under-pressure and Over-pressure. I think the numbers are 24psi and 50 psi respectively.
As someone suggested, check the pressures. 32psi front and 30 psi rear - I Think.
If they are set to manufacture specifications, take it back and have them check it out as they may have damaged the sensor and not realized it or didn't care.
It's too new for a dead battery.
As I recall it, the sensors started working at about 15mph. The check every 30 secs and report to the receiver about every 1 minute. When not rotating for 15 minutes or so, they go into a sleep mode. When you start driving again the cycle begins again.