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