View/Modify Orders Status
Settings->Order Statuses Edit

Overview
Here you can Add/Edit the order statuses that will appear and you'll be able to search after in the Orders section.

Elements
List of orders status
Here you'll see and edit/delete the order statuses that exist.

Add a new order status
You may also add your own order statuses that you need to be able to search after.

Links

From here you can:

Update settings [Save settings]