Before attempting to reset the disposal, turn off the power supply by unplugging the unit or closing the circuit breaker. Look for a small red or black reset button on the disposal unit, usually located on the bottom. Insert an Allen wrench into the hole located at the bottom of the disposal unit.
Use a wrench to rotate the blade back and forth to remove any stuck objects. Once you have turned the blade, press the reset button on the unit. Then, turn on the power supply and run the water into the drain. If it still doesn't work, it may be jammed or there may be an electrical problem.