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