Set the docking station valves to "country fill" or "sanitize tank" depending on what valve set up you have. Connect the winterizing hose and turn on the pump and pump water into the tank. Be sure to flip the cone screen to push open the check valve, just be sure to flip it back when the tank is full.
All info should be in the owner's manual.. If you didn't get one you can download it here 2017 should be same as 2018.
https://www.jayco.com/tools/archive/...and-downloads/