get a non working page

I’m not 100% sure what you’re asking. I think you’re asking about adding additional navigation to elsewhere on your site in the post templates provided by the plugin. To do this, you could override the header.php template to add a nav menu.

For example, in your theme you could create a amp directory, and inside this directory create a header.php file that contains:

$this->load_parts( array( 'header-bar' ) );
wp_nav_menu( array( 'location' => 'primary' ) );

You’ll also want to style the menu by adding something like this to your theme’s functions.php:

add_action( 'amp_post_template_css', function() {
	?>
	.menu li {
		float: left;
	}
	<?php
} );

This is all for the existing post template system in v0.6 of the plugin. Starting in the next version (0.7) it should be much easier to add things live nav menus since themes will work in a way that is much more similar to how WordPress does themes in general.