What is an Order Status?
The order status field is a value which encapsulates where the order is in your workflow. Zen Cart has the following default order statuses:
New order statuses can be created in Admin > Localization > Orders Status.
How can I set my orders to status Shipped?
You can add a new order status (Shipped) by going to Admin > Localization > Orders Status.
Then go to Admin > Customers > Orders and update the order’s status to ‘Shipped’ making sure that you set the Notify Customer radio button to Email.