PHP snippets for Subscribe button not showing button

Hi there,

The page admin/help/lm_paypal_subscriptions, under the "Inline PHP snippets" states that the code below would create a subscribe button.

<?php
if (function_exists('lm_paypal_can_subscribe')) {
   $subid = 1;
   if (lm_paypal_subscriptions_can_subscribe($subid)) {
      print 'Why not subscribe now? ' . lm_paypal_subscriptions_subscribe($subid,8);
   }
}?>

I've followed instructions but the page/block doesn't show the button at all

What am I doing wrong?