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"Place Order" confirmation message

The situation…
A customer comes to my site, shops and commits to a purchase. She proceeds to checkout, completing the required form (customer address, CC#, Shipping info) and clicks the “Place Order” button. Then that’s it. All editable field turn to labels and there is no confirmation message.

I need to create a modal (or something) giving the customer a confirmation and instructions for what’s next. Such as - “Thank you for placing your order. Please check your email inbox for and email confirmation.” Any insight on how to tackle this would be greatly appreciated.