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Paste the code to your Constant Contact website’s HTML field.
Next, go to your Constant Contact page editor and find the HTML field. It is most likely in the form of an HTML/Code widget or module which you can find on the Constant Contact’s editor. Add it to your page, and paste the Comments Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Comments app on your Constant Contact page.