This is something you certainly can accomplish either using the
Site Visitor Sign Up Form or using one of the various APIs. To use the Site Visitor Sign Up form, you use your Constant Contact account to generate HTML for a "Sign Up" box and then paste that section of HTML into your website. To use the APIs, you need to have some coding knowledge to customize the webpage to also send the sign ups to Constant Contact. I would refer to our
API Documentation for more information on how you can do this
Dave Berard
Senior Product Manager, Constant Contact