As john said you can use an options page and call the field using;
<?php the_field('field_name', 'option'); ?>
Or if you want to put the fields on one of the pages for usabilities sake (although using an options page would be best practice), you can put the page ID of the page with the fields on as a parameter on the other page like so;
<?php the_field('field_name', 67); ?> <!-- replace 67 with the page ID you want to call the field from -->
Hope this helps, thanks.
