I want to remove the title that is overwriting my graphic in 1.5.2

So far no one has answered this question – I’m sure the answer is very easy. I’ve upgraded to 1.5.2 from 1.2. I have special banner art which I now display. However, the blog title appears in white letters. Supposedly, if I put the following code somewhere:

h1 {position: absolute;
font-size: 0;
left: -1000px; }

the blog title will be moved out into the aether somewhere and not displayed, which is what I want to do.

My question is, where do I put this code? Do I put it in “style.css” and, if so, where? Do I put it in “header.php” and, if so, where?

The documentation uses a lot of jargon such as “aural” something-or-other rather than plain English.

Thanks,