I'm not sure what forum software was used for this site, but below is a list of the ones that TapaTalk is compatible with. It's usually a plugin that the site administrator applies to the site make the forums available to the TapaTalk app. I might add, it's a great app and makes it easy to participate in the forums using a mobile device. I +1 it.
Jon, if that's something you're interested in doing, I might be able to help. My day job is web development. Just let me know.
Q: Which forum system does it currently support?
phpBB3,
vBulletin,
xenForo,
IPBoard,
Simple Machine,
MyBB,
bbPress,
Kunena and
Vanilla are supported. Other forum system might also support Tapatalk with plugins developed by third party developers using
Tapatalk API.