I turned Carbonite off, can't get it back on.

[HoldenAndSalinger]

Sorry, I'll most likely be flamed. I checked the stickies and the FAQ page and couldn't find an answer. I turned carbonite off today because some of the chat functions weren't appearing to work (I was LFG in Dalaran for the weekly, I could only see 1 other person's text, Thrall server alliance). My question is a simple one, how do I turn carbonite back on? I went through the interface menu and couldn't find anything. I've even tried an uninstall and reinstall... nothing. Any help?