In the direction from Krupina to Zvolen, take the left turn to Holý Vrch (after clicking here you will be redirected to the map). 

If you are traveling from Banská Štiavnica, choose the road through Žibritov to Krupina and then towards Zvolen until the turnoff to Holý Vrch.

The road from the turnoff is marked with signs, so you will definitely not get lost. Alternatively, you can directly enter this location in the navigation and continue according to the signs.