Add a barcode list by clicking on the '+' button at the bottom right.
You will be taken to the next screen:
Select the products you want to print a barcode of by searching by the ''magnifying glass'' and ticking the box to add them to your list.
Go to 'Name' and name the selection you have made. Select 'Confirm selection' to save it. The selection or list can be found under 'My barcodes'.