In order to place your order as a purchase order just contact us and we will take care of it. You can either place your purchase order or get a order quote that you can then take back to the board to get approved. You can contact us at 800-469-8070 or email us at firstname.lastname@example.org to get started.
Alternately ordering online is a little easier, faster and very painless to do. However shopify has yet to come out with a solution to purchase orders and paying with terms so if the only way you can order is with a P.O. follow the steps above, otherwise just start shopping. Online orders do give you an order number that could possibly work as a purchase order number if you can order first and then give them the P.O. number using the order number as the P.O. number after ordering.