Voltage manipulation is usually reserved for mid tier to higher end boards. Boards that are built around the H410 shouldn't be having the option. According to the manual,
here, the BIOS has an option for
Vcore Voltage Mode/CPU Vcore/Dynamic Vcore (DVID)/BCLK Adaptive Voltage/CPU Graphics Voltage (VAXG)/DRAM Voltage (CH A/B), perhaps that will allow you to manipulate the voltage on your processor. As a side note, I don't think you're going to need to do an undervolt on the processor...come to think of it, the stock cooler is just a waste of material, better invest in a cheap aftermarket cooler like the one made by Vetroo V5(or cheaper).