I looked at this carefully for my latest double sale.  Through 'Selling' and 'Overview' it shows the sale I want under the heading 'Dispatch Now'.  I click on the dropdown next to the 'Get Postage Label' button, but the only four options that appear are 'View order details' 'View payment details' 'Cancel Order' and 'Message buyer'.  Going through to the order details gives me further options, but there is no sign of the two you mention.