All DirectFreight Express labels are manifested automatically at 6.30pm daily, so you can only reprint a label before 6:30pm on the SAME DAY it was originally printed.
To be able to create a new label for an order, you must first delete the original label:
Expand the order.
Click the Delete Consignment button.
This will clear the current consignment from the order in ReadyToShip, and delete it in the DirectFreight Express system.
Next:
Edit the details you need to change (eg, the total weight of the order).
Select the order and click Print Labels again.
A dialog box will pop up, asking if you want to Reprint or Update.
If you have changed the order, select Update to ensure the label is regenerated with the new details.
Otherwise, just select Reprint to generate a new label.
Most importantly, don't forget to discard the original label and use the NEW label on the parcel!