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Paste the code to your Mailchimp Website Builder website’s HTML field.
Next, go to your Mailchimp Website Builder site 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 Mailchimp Website Builder’s editor. Add it to your page, and paste the Call Button Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Call Button integration on your Mailchimp Website Builder site.