Go to the + at the top -> Click Order -> Select Account -> Make sure all fields with a * are filled in -> Click Next
Now a window with 6 tabs will appear.
Overview - is where you can add general information regarding the order.
Order Rows - Here you can add the articles you want to place an order for. Choose quantity, Price, Discount etc.
Dynamic Fields - Here you can write/add info about the order.
Delivery - In this tab you can change delivery status, day of shipping, delivery address etc.
Invoice - Set invoice date, account and address here.
Document - Here you will be able to upload documents related to the order. If you print your order, a pdf file will be created and you will be able to see it in this tab.