Assuming that your arrows are spined properly and you have checked the broadhead alignment with your shafts and your broadheads do not wobble at all then broadhead tuning is very very simple.

Move your rest toward the field tip group in very very small incriments. Like 1/32 - 1/16 inch at a time.

Your field tip group will move as you do this but not nearly as much as your broadhead group will. They will eventually come together.