I previously used MIRC to connect to IRC, but I realized that Trillian also has its own IRC connection.
To set up IRC In Trillian:
-Open the Manage Connections menu
-Create a new IRC connection
-Name it whatever you want
-Browse to or manually add: irc.us.gamesurge.net::6667 as the irc server to connect to
-Give yourself a nickname to be used in the channels
-Accept your changes
-Now edit the connection you just made
-Click the 'Change' button under your Identities & Connections menu for IRC
-Go to the 'Connection' Tab, under the 'Perform Buffer' tab
-Add the following text: "/join #herosjourney;/join #HJ-Tavern" (or just one of the two.) This will put you in both channels.
The Trillian IRC chat window looks just like a Group Chat for AIM/MSN/Yahoo/etc... When you close the chat window, you stay connected to the IRC server, but you do not stay in the channels.
You will need to manually "/join #herosjourney" to get back in.