Log in to your Duda account and go to the site you want to add the widget to. Click on the "Widgets" tab on the left-hand panel.
Select the "Custom HTML" widget from the list of available widgets.
In the "Edit Content" window, paste your widget code.
Click "Update" to save the widget and see the result.
Please note that the appearance of your widget may depend on your website's styles. Avoid adding your widgets to existing elements or blocks if possible. Certain features might be blocked on some platforms.