In the “Name” field, type image_source, and in the “Value” field, paste the URL you wish to use to link to as the attribution/source.

Click the “Add Custom Field” button; and then the “Publish/Update Post” button.

Then, place this code in custom_functions.php:

function image_source() {
global $post;
$source = get_post_meta($post->ID, 'image_source', true);
  if ($source)
    echo '<p><a href="' . $source . '" rel="nofollow" target="_blank">Image Source</a></p>';
}

add_action('thesis_hook_after_post','image_source');

Note: After the first time you add the image_source custom field to a post, you’ll then be able to simply choose it from the drop down selector under “Add new custom field”, rather than having to choose “Enter new” again.

<a href="https://diythemes.com/thesis/">Thesis WordPress Theme</a>

Remove Thesis Attribution ∞

Place this code in custom_functions.php:

remove_action('thesis_hook_footer', 'thesis_attribution');

Add Copyright ∞

Place this code in custom_functions.php:

function copyright() {
		echo '<p>Copyright &copy; 2008&ndash;' . date('Y') . '</p>';
}
add_action('thesis_hook_footer', 'copyright', '99');

Place Admin Link on Same Line as Attribution ∞

Place this code in custom_functions.php:

function my_footer() {
	echo '<p>Get smart with the <a href="https://diythemes.com/thesis/">Thesis WordPress Theme</a> from DIYthemes. ';
	wp_loginout();
	echo '</p>';
}
remove_action('thesis_hook_footer', 'thesis_attribution');
add_action('thesis_hook_footer', 'my_footer');

Display Category List ∞

Place this code in custom_functions.php:

function footer_cats() {
echo '<ul>';
wp_list_categories('title_li=');
echo '</ul>';
}
add_action('thesis_hook_footer', 'footer_cats',99);

Place this code in custom.css:

.custom #footer {
  text-align:center;
}
.custom #footer ul,
 .custom #footer li {
  display:inline;
}