The Mercurial theme includes the display of a logo in the header. The absolute easiest way to change or remove this logo is by using the ThemeStarta WordPress Theme Creator.
If you are a ThemeStarta license holder you can read about working with logos here.
However you don’t have to use ThemeStarta to add your own logo image.
Logo Change Without ThemeStarta – Method 1
The easiest approach is to replace the logo by creating your own logo file named “logo.png” and uploading it to your theme’s images folder, i.e. wp-content/themes/mercurial-for-storestarta/images/
The best thing is to ensure your logo is 238px wide by 59px high.
If your logo image is a different size you can go to the “contentlayer_wp” folder of your theme and open the “header.php” file.
In there you can look for this:
and change it to suit your logo.
Logo Change Without ThemeStarta – Method 2
Alternatively, there are the WordPress header controls which can be found under Appearance > Header. You can read about using this tool here: http://codex.wordpress.org/Appearance_Header_Screen
Using this tool you can add a custom header image that includes your own logo.
If you do this, you’d want to remove the existing logo image. To do that go to the “contentlayer_wp” folder of your theme and open the “header.php” file. Locate this:
<a href='<?php echo home_url(); ? rel="nofollow">'><div class='logopos'><img src='<?php bloginfo('template_directory'); ?>/images/logo.png' alt='<?php bloginfo('name'); ?>' height='59' width='238' /></div></a>
…and delete it.