We have a video that will guide you through the process of ordering your own book at the UPM website and using the author discount code you will be sent.
Take a look at https://www.upress.state.ms.us/Ordering/Author-Ordering-Video
If you are ordering a quantity of books for an event you have planned, have you alerted your publicist to that event? If your book is printed on demand, there are some timing issues to consider. Please read the article WHAT PRINT-ON-DEMAND MEANS FOR YOUR PLANNING.
If you are ordering a quantity of books for an event, have you explored an author EVENT order with your sales manager, Steve Yates? Email him.