to let your engine cool off a bit and you can check your fluids. do not touch the radiator cap (even if bright green fluid is pouring out of it). it is very hot. in case you forget, just read the knob. it will remind you.
replace any low fluids if you can. if you start it again and the temperature seems normal, drive on but keep a very sharp eye on your temperature. you may need to get it to a mechanic as soon as possible. if you start it again and the temperature is still climbing, it might be time to call in some back up. friend. tow truck. 