Help with winterizing T-2553

Hi. I’m a total noob. I picked up a Solaris T-2553 late summer. I live in the northeast and need to winterize it. I bought some PG antifreeze. The manual says something about a hot water heater bypass. Where do I find if my trailer has that? Also, if anyone has tips for me, I’m all ears. This is my first time doing this. I love it!