If you have the receipt with a barcode on the bottom, simply scan the barcode and it will pull up the transaction regardless of where it originated.
If you do not have the receipt, or your receipts do not have a barcode, select the Load Transaction flip chart. When the Load Transaction screen pops up it will default to the current till, but you can select any till from the dropdown menu.
Once you highlight the transaction you are looking for, you can press Enter to complete the transaction, or you can press F2 to Delete it. The Delete feature is also new and can be controlled by permissions.