stupid newbie question on adding a header logo

[Preds]

First off, I'm pretty much a complete newbie when it comes to templates, styles and HTML, particularly when it comes to vB 3.0.0 RC4 which has made things much more complex then 2.3.4 for those that are programming illeterate like myself!

In 2.3.4 setting the main header banner img was pretty easy, but in 3.0.0 RC4 I get completely lost.

I know some basic HTML, enough to have a rough idea what's going on and how to edit here and there, but my overall understanding of how HTML functions is fairly lacking.

Basically, I've converted a test board from 2.3.4 to 3.0.0 RC4 and lost my header logo in the process.

In looking at all the templates I can't find where I'd actually add the info pointing towards the banner img (which I'll call "bbtitle.gif" for ease).

Can anyone tell me where and how to do this?

Thanks