What you need to do is supply the post id. You can either hard code it or you might be able to get it dynamically by accessing the WP page on front value if you have this set http://wordpress.stackexchange.com/questions/165374/how-to-get-post-id-of-static-front-page
$post_id = GET OR SET POST ID
get_field(‘my_field’. $post_id)
See the “Get a value from a specific post” section of https://www.advancedcustomfields.com/resources/get_field/
