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Paste the code to your Plone website’s HTML field.
Next, go to your Plone website 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 Plone’s editor. Add it to your page, and paste the Calculator Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Calculator add-on on your Plone website.