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