How can I add a logo like I have on my phpBB forum http://alienbabeltech.com/abt/index.php
to my WP Blog- Site
From some links I understand that I have to edit the header.php file and in there I have to edit
<div id="logo"> <h1><a href="<?php echo get_option('home'); ?>"><?php bloginfo('name'); ?></a></h1> <span><?php bloginfo('description'); ?></span> </div>
But I don't know any html or CSS. How do I go about adding a logo to my forum and what should the size of the image be ?