Changing your thesis logo is very simple, and I’ll show you how in the following video:
You can watch it on youtube if you want
I included below the code I used on the video for a quick reference:
function custom_logo() {
?>
<p id="logo"><a href="<?php bloginfo('url'); ?>"><img src="http://creatr.cc/creatr/logo/My%20New%20Blog.png?1257615311" /></a></p>
<?php
}
add_action('thesis_hook_header', 'custom_logo');
Just remember to un-chech show site name in header and show site tagline in header from the display options.