How do I confirm or update an order?

Open the order under Orders → Manage Orders, pick the new status in the status control at the top and click Update Status — for example Processing once you have confirmed it, then Shipped, then Delivered. Each change is recorded in the order's timeline.

If you have a shipping carrier enabled, enter the tracking number in AWB / Tracking No. in the Fulfilment & Tracking panel and click Mark Shipped. With the Push Notifications plugin, setting Shipped also sends the customer a shipped alert.