When editing a page with Elementor, use the Search Widget field to find easy the Coupon Code element.
Drag and drop the element into canvas for it to appear. A set of controls on the left, in Elementor sidebar is available.
General widget Settings
Coupon Code - Set the coupon code value that will be copied to clipboard.
Message After - Set a message to display after click.
Message Timeout - Time in milliseconds to hold the message.