Took me a while to hunt down how to do it but here is a tutorial on how to make private channels went through like 10 sites before i found one not in Korean.
http://tera-forums.enmasse.com/forums/valley-of-titans/topics/Private-Channel-Mini-Guide-maybe-official-pvp-channels
http://tera-forums.enmasse.com/forums/valley-of-titans/topics/Private-Channel-Mini-Guide-maybe-official-pvp-channels