Well, once you get into Kulem, which is on the national highway 4A, You will need to take a turn at the HP petrol pump at Kullem and then take the road to the park. You will need to drive around 9 to 10 kilometers. Please note that the road is not suitable for a regular car. I would advice you to take a trip through a SUV or bigger jeeps. The road has a few rivers that criss cross all along.
If you want, the local taxi operators operate the trip for you. Only six persons are allowed per vehicles and the trip costs around Rs. 2000. The driver cum guide rides you to the falls and waits for around two hours.