When integrating a standalone form into a website outside of Sphere, we suggest using an iframe to do so.

You can learn more about iframes here:  http://www.w3schools.com/tags/tag_iframe.asp

The iframe will load the form into the external page without compromising the form's security. 

Note: This is provided as a suggestion to accomplish adding a Sphere form to an external website.  However, implementing forms into other websites falls outside the scope of Blackbaud support.