...

1. Right-click the order and choose the new “Export Media” option. 
2. This will save the applicable photos to a folder where they can then be copied to a fresh USB stick.
3. Open that folder, open the drive where the USB is plugged in and copy over the images.

FAQ

1. Do I need to use Lab 50 to create the USB?
   1. Yes. (Or Print 50). 
2. Are you going to ever have it like the DVDs, where you can "burn" it at the kiosk?
   1. This is not planned for the short term. Long term remains to be decided.