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Paste the code to you Plone website’s HTML field.
Next, go to your Plone website and find the HTML field. It is most likely in the form of an HTML/Code widget or module which you can find on Plone’s dashboard. Add it to your page, and paste the code you’ve copied before to the HTML field. Save and update, and that’s it, you should have Common Ninja’s Bracket Maker add-on on your Plone website.