If you wish to reprint a label you can do it by getting into Shipment View. You get it by double-clicking on a transmission, either that you do it from the Outbox - search - Transmitted batch or sent.
When you get a Shipment View the Print button freight documents (pictured below)
Then you get a window with a Print button, here you can then choose which document you want to print. Uncheck the label as if you already have the label but you will have the waybill again.
If you have gotten out all the labels but one was destroyed, you can also print only the selected tag by going to the tab Packages.
Then press the Print when you want to get the selected documents.