Go to this link:
http://www.ghostskies.com/forum/index.php and drill down into the General Discussion forum and post your interest. You will then be directed here:
http://www.ghostskies.com where you will also need to register so you won't get booted from the campaign server on mission night.
In the General Discussion section, there is also all the information about our TS3 channel and some of the features of this style of online sim experience.