what if u put a pot in the place of the resistor , would you be able to adjust it more easily?

From Yebo Electronics: Not that easy, depends of which resistor you refer to. Changing a resistors value could result in damage to the circuit as it might, for example, affect the biasing on one of the transistors or the IC. As the unit is designed to provide about 22,000V we would suggest this is more than adequate for most intended applications.