You can't see labels until you buy them...but you can view the details to verify everything is correct
See Shipment Details: We don't currently have a label preview feature...but on the Buy Label page, you can click the "+" sign next to the Shipment Details to expand the package details.
Here's where to find the "+" sign:
Expanding & Collapsing Shipment Details: Once you've clicked the "+" sign, that information will remain static on all your shipments. You can always hit the - sign to collapse the preview field again.
Here's how the Shipment Details section looks when it's expanded:
Additional Resources