I send registration forms via email as a pdf attachment. The person downloads the attachment, fills in the correct information and either emails the filled in form or snail mails the filled in form depending on how adept the person is at working with pdf files.
Be aware that depending on the email the person uses, not all allow "hot links" so clicking won't always work.
Be aware that depending on the email the person uses, not all allow "hot links" so clicking won't always work.