Alter the Blog Entry Heading Tag

/**
 * Alter the blog entry heading tag from H2 to H1
 */
function myprefix_blog_entries_heading( ) {

	return 'h1';

}
add_filter( 'ocean_blog_entries_heading', 'myprefix_blog_entries_heading' );

All PHP snippets should be added via a child theme's functions.php file.