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You can reprint labels from within the order details. If you click into the order details you can select the label in the top right hand corner. You'll see a Print button with a drop down menu including Label as an option. This would be for reprinting existing labels.
Alternatively, if your previously shipped order needs a NEW label, you'll want to select Create Another Shipment so that a secondary shipment could be configured and subsequently have a new label, with a new tracking number, created.
I hope this helps!