To add a link to the homepage in your navbar, you can use the following function to add a link to the home page in `wp_page_menu_args`

    function wpse01_home_link( $args ) {
       if ( ! isset( $args['show_home'] ) )
          $args['show_home'] = _x( 'Home', 'homepage' );
       return $args;
    }
    
    add_filter( 'wp_page_menu_args', 'wpse01_home_link' );

You can just rename `Home` to suite your needs