You may find that email providers with form collection may have some html that you could try adding to the head content of your site to add an newsletter sign up form to your site. If the script creates a <form> tag on the page then it will not work correctly. Most services have a way to generate a link that will go to a sign up form. That would be the best solution rather than putting the form directly on the page. Any 3rd party form would work directly on any pages in PrintNow, just avoid putting forms in the master pages that are used on every page, input your code within the CMS pages that are unique.