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