[theme: Oxygen] Remove parent/child path on top of each page

Remember to double-check your link to see if it’s correct after you post it.

That’s called breadcrumb, it’s good for SEO.

Use this bit of CSS to make it invisible to users.

.breadcrumb-trail, breadcrumbs {
	position: absolute !important;
	clip: rect(1px 1px 1px 1px); /* IE7 */
	clip: rect(1px, 1px, 1px, 1px);
}

Use child theme to hold all the modifications.
http://codex.wordpress.org/Child_Themes

Or use one of these Custom CSS plugins
http://wordpress.org/plugins/search.php?q=custom+css