Here'a a picture of what my regulator looks like (generic picture that i pulled off the net). I've taken a wrench to the circled part and it won't budge. I also tried using PB Blaster and gave it a good soak, but that also did not work. I don't own a pipe wrench or a channel lock wrench so I haven't given that a try. Part of the bolt was also stripped off when I tried to unscrew it, so at this point I may be SOL.
I think I'll probably just opt to use one of these for the time being
and eventually upgrade to this: