[tbworld]

In:
admincp->settings->General Settings->Add Template Names in HTML Comments->YES

This will add a comment field in your HTML source with the template name. Then just use your browser to look at the webpage HTML source for the template name comment. In this case it will most likely be at the very top of the page. Or you can search the source for one of the template names in the last message. I prefer Firefox for this with firebug, but all the major browsers have similar tools.

The other way to find the right template is to use template search in admincp. Here you can look for text or phrase in a template. See vbulletin manual for more information if you need it. Trial-and-error will get you what you want.

If you cant find it. Just take a web-snapshot of the page and post it here. (Try to do it in the default vbulletin style ... ).

Once you have the template. Inserting a block is easy, the more difficult part in this case is the styling... but it is easy enough. We will also need to add a conditional, because I believe you wanted this only for a particular forum.

I hope this is clear, I need sleep, jet lagged.