The Coolant light illuminates on the dash to let you know your coolant, also known as anti-freeze, is low. There is a level sensor in the coolant overflow tank. So when the coolant level gets low the light will illuminate on the dash.
What you will need to do is check the fluid level once you get where you are going and the vehicle has had a chance to cool down. Also check the radiator level (do not do this when it is hot) . Top off the coolant level in both the radiator and in the overflow tank. Make sure if you are using concentrate to mix it 50/50 with water. Once you have done this you should be ok to drive it to your local auto shop and have the coolant system pressure tested to make certain there are no leaks.