s2Member Pro forms, changing the position of any of the field section including the coupon section

To bring the coupon code field position below all the other fields, you need do the following:

Take this file:
/wp-content/plugins/s2member-pro/includes/templates/forms/paypal-checkout-form.php

And copy it into your active theme directory.

Now you can edit this file and do things like bring the entire coupon section to the bottom of the list of fields.

The name of the file should not be changed.