I don't have that model, but with an to do unut, you basically need to figure out which line is the incoming line which you connect to a water source. Then there should be a waste and a good line left. Good line is for fish. And waste line is for whatever you want to do with it either down the drain or a lot of people run that line outside into garden beds particularly in the warmer months.
Finally figured it out, but my pressure gauge is broken. This is not one of my talents, but I finally did it with 2 phone calls and feeling like an idiot!