I can't help with becoming a member, but their
US website lists points of contact in most, if not
all, Catholic dioceses in the states.
If you're not in the US, you might find useful contact info on their
global site.
Incidentally, I have to say - without being disrespectful - that one would think such a venerable order would be able to find, somewhere among its
ranks, a copy-editor.
They are similar to the Sovereign Military Order of Malta, in that they have managed to survive since the Crusades, and they enjoy the "protection"
and blessings of the Vatican. And of course, they do good works. But as far as I know, they do not have the unique diplomatic status that the SMOM
have secured for themselves.
As I said, I can't tell you how to become a member. From my reading, in addition to being Catholic (duh) you are required to swear some sort of
"Oath against Modernism," or some such.
Good luck, I'm sure being part of that organization would be something to be proud of. There are, after all, very few ways to legitimately be called
a Knight these days.
