Change the title and home menu navigation links

Take a look here for creating your own menu:

https://en.support.wordpress.com/menus/

I know it is wordpress.com but it is the same in Twenty Twelve.

Thank You for your help. Is there a way to change the title at the very top to point to a top domain

I found this code in the header.php file

<h1 class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></h1>

Thanks