Paste the code to you Durable website’s HTML field.
Next, go to your Durable website and find the HTML field. It is most likely in the form of an HTML/Code widget or module which you can find on Durable’s dashboard. Add it to your page, and paste the code you’ve copied before to the HTML field. Save and update, and that’s it, you should have Common Ninja’s Progress Circles widget on your Durable website.