mradiator light is lit up on dash panel

You likely have a coolant leak and a low coolant level. The reservoir is in the engine compartment and will likely have a green cap on it. Do not open if the engine is warmed up, wait until it has cooled down. Then you can top up to the "Max" line. Check for leaks too and get them fixed. Whatever you do, don't allow the engine to overheat, you will do much damage to the engine.