How do you get the anti theft light to stop flashing on my 1986 300zx?

To stop the anti-theft light from flashing on your 1986 300ZX, first ensure that the vehicle's ignition is in the "Off" position. Then, try unlocking the driver's door with the key, which can sometimes reset the anti-theft system. If the light continues to flash, it may be necessary to disconnect the battery for a few minutes and then reconnect it to reset the system. If problems persist, consult the owner's manual or a professional for further assistance.