If the light switch isn’t working, first make sure the bulb in the fixture is working by testing it in another switch/fixture combination that you know is working.
If you are certain the bulb is good, and the switch is still not working, there may be no power to the circuit.
Go to the appropriate electrical panel/sub panel and make sure the breaker is in the ON position. If the switch still doesn’t work after resetting the breaker, you will need to contact a professional for help. If you are within the warranty period (1 year), you may contact us.