If it's like most "normal" ones, HAHA, there should be a port labeled "Winterize" or something similar and the second valve is to switch so the pump is pulling from that port. So you put a short hose from your antifreeze jug to that port, switch the valve to Winterize, and the pump "should" suck the AF into the system.
Don't forget to put some AF into the City Water port to protect the check valve in there, the black tank flush port if you have one, the outside shower, etc. All many things a lot of us forget. I bought a cheapy kerosene hand pump at Ace for a couple $ to do all the small things.
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2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)
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