Welcome to the board.
A quick web search turned up this:
The Edge Epic second stage is a fully balanced design that provides the diver with comfort and easily adjustable air flow. The Epic second stage has a completely diver selectable venturi adjustment and a diver adjustment handle to provide the diver with complete control over the regulator opening effort.
This indicates there are 2 controls on the reg, a venturi assist and a cracking pressure control. The venturi assist will be a lever of some sort, usually labeled with +/- or min/max. The cracking pressure is the knob on the side that rotates. SO, how to adjust them. To some extent it is divers choice and the best advice is to play with them and see what you like but in general, I like to set the venturi assist to min any time the reg is not in my mouth, this prevents violent freeflow and yes the reg should freeflow it the VA is set to max and the purge button is pressed or you drop it in the water, esp if the cracking pressure knob is set loose as well. I set it to max during the dive. If the regs seems to be force feeding you air when you breath, back off of the setting some. On gentle breaths you really should not notice much effect but really inhale hard, the venturi will be very evident. The cracking pressure I set a variety of ways depending on the dive and what the reg is doing at the time. When not in use- not pressurized, I release it fully to relieve pressure on the seats and springs. When I pressurize the reg I set it mid range (unless it's an octo, in which case cracking pressure is set to max and venturi to min) and then adjust while diving as I like, usually just shy of a gentle freeflow but again, it's really what you like.
