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