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Paste the code to your XenForo website’s HTML field.
Next, go to your XenForo community 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 XenForo’s editor. Add it to your page, and paste the Coupon Popup Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Coupon Popup plugin on your XenForo community.