Assuming you are asking about the coolant level and not a specific problem:
The best way to check your Honda's antifreeze is to take a look at the overflow tank when the car is cool. The engine should be cold so that you don't accidentally get burned. If the coolant level is below the full line on the overflow tank, then you will need to add more antifreeze. You can buy pre-mixed 50/50 coolant at most auto stores, or just mix your own using distilled water and pure antifreeze.