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