To add an item to an order by product number/barcode first make sure you're viewing the 'Order' screen by clicking the 'Order' tab in the main navigation located towards the top of the catalogue window.
Next locate the 'Add to order' form near the top of the screen just below the main navigation tabs. (Shown in picture above)
Now you need to enter a product code/barcode in the product code text-box. Once that is done you need to enter a quantity into the quantity number input.
If you are satisfied you have entered the information in correctly click the 'Add to order' button with your mouse and the new item will appear in the order list.
See also:
Adding a product to an order
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