Open Your editor, search on header.php on the right.
When You click it, use ctrl+F to find this on the script:
<h1 id=”site-title” role=”logo”>
<a.>” title=”<?php echo esc_attr( get_bloginfo( ‘name’ ) ); ?>”>
<?php if ( get_theme_mod( ‘bearded_logo’ ) ) : ?>
<img src=”<?php echo esc_url( get_theme_mod( ‘bearded_logo’ ) ); ?>” alt=”<?php bloginfo( ‘name’ ); ?>” />
<?php else : bloginfo( ‘name’ ); endif; ?>
</a.>
</h1>
<h2 id=”site-description” class=”hide-for-small”><?php bloginfo( ‘description’ ); ?></h2>
</hgroup><!– #branding –>
Replace the bold script into your logo url. Hope it’s help. I’m sorry if My english suck.