Are you trying to add a newsletter sign-up to your WordPress.com blog? Have you discovered that WordPress.com doesn’t allow forms or scripts in text widgets?
If you don’t have an account with an auto-responder like Aweber or Constant Contact that hosts forms for you, it may be very difficult for you to find a way to allow people to sign up for your newsletter through your blog.
If you don’t mind a manual process once you’ve received each name and email (you have to manually take those names and add them to your newsletter mailing list one by one) here’s a step-by-step way that you can add a newsletter sign-up form to your WordPress.com blog. Click the link below to access the document. You’ll need Adobe Acrobat Reader to view it.