Tire Pressure light on my car won't turn off!

Yeah I blew a tire on my old chevy malibu once and went to get the spare out of the trunk and well…the spare was flat. I always remember to check the oil cars, check all the other fluids as well but I always forget about the darn spare until I have a flat, go figure. I checked the tire pressure today and the front left tire is a little low. Time to go get it taken care of!