First you need to select “Retail Menu”, just like the image below.
then once you have done that select the “Refund and Layby Cancellation”, like the image below.
Then you are on the “Refund Page”, Where it says Layby Cancellation, Click the button like below,
Then this Popup will appear,
Then enter the layby number and the home much you are going to refund the customer, the press “Done”, and Save the Refunds Buttons.