Order # Issue

After checkout and the PayPal redirect, there is a place that should show the
order number, and it doesn't. Here's a cut and paste of the text that customers see:

Thank You! We Appreciate your Business!
Your Order Number is:
You did it! Your order was successfully sent to our orders center. Please
note that we do not ship orders that were paid with an e-check through
PayPal until that money has cleared our bank. We ship every other day,
including Saturdays.

How do we make sure it adds that order number in there?