Just found out something interesting (and helpful) concerning the ""The template that this document is based on does not allow changes outside of the <html> tag. The change you made will be discarded" error. If the page can't be validated (File/Validate) Dreamweaver will throw up this error. I validated the template file and found two errors. Fixed them and was able to apply the Template and then the Theme to the Security Assist pages. Awesome!