lm_paypal: Create Classified Advert, intro text customization

When I click Create Classified Advert, there is an introductory paragraph which I would like to customize:

Nodes of this type will not be published until paid for.
After Submitting this new node use the PayPal Publish tab to publish.
The status of paid items can be found under my account.

As far as I know, this is hardwired in the module lm_paypal_paid_adverts.module, but it would be better if it was customizable in the Content types editor.