Thanks for your question! Check out these great posts that @Samantha_O wrote up on our Signup Form that you can add to your website below.
These should help you with getting the code from Constant Contact. We do not know how to insert it into your website. You'll want to contact your website developer for that.
Hope that helps!
Thank you very much for this. Marissa, we are moving our site off our current platform and will be looking to integrate constant contact.
That's great news! Please let us know if there's anything we can do to help!