Jetpack Infinite Scroll Support

I am trying to integrate Jetpack Infinite Scroll into Zombie Apocalypse.
This is what I have so far:

/**
 * Add theme support for infinite scroll
 *
 * @uses add_theme_support
 * @action after_setup_theme
 * @return null
 */
function zombie_infinite_scroll_init() {
    add_theme_support( 'infinite-scroll', array(
        'container' => 'content',
        'render'    => 'zombie_infinite_scroll_render',
        'footer'    => 'wrapper',
    ) );
}
add_action( 'init', 'zombie_infinite_scroll_init' );

***I’m not sure what to put for this part!!!

/**
 * Set the code to be rendered on for calling posts,
 * hooked to template parts when possible.
 *
 * Note: must define a loop.
 */
function zombie_infinite_scroll_render() {
    get_template_part( 'loop' );
}