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Paste the code to your Squarespace website’s HTML field.
Next, go to your Squarespace store 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 Squarespace’s editor. Add it to your page, and paste the Headline With Background Image Embed Code you’ve copied before to the HTML field.
Save and update, and that’s it, you should have Common Ninja’s Headline With Background Image plugin on your Squarespace store.