How do I get rid of something in AdminCP?

[axiomotion]

I installed this hack a while back and after some messing around with it I finally got it to work. I plan on upgrading to VB3.5 this weekend and have removed almost everything for the hack other than the "shoutbox" panel in the admincp (it shows up under "subscriptions"). I want it gone before I upgrade. I asked how to remove it and was given this advice. I followed this thread and put the site in debug mode but when I went back to the board it appeared exactly the same. I couldn't find any delete button to press. Did I make an error in where to place the code? I put it right after

// Prefix that all vBulletin cookies will have
// For example
$cookieprefix = 'bb';

I tried it a few times but I can't seem to figure out how to remove it from my admincp.

Thanks in advance for the help