Thank you for your question.
You would list the fragrances (by the 3 digit number for ease and less typing) in the COMMENTS BOX during check out. This is the last empty box you will see during check out after you have entered your address and payment info. Make sure to scroll to the bottom of the page. The text box we had available on this page is too small and hard to see what you have entered into it. You will find all the fragrance numbers on the PRINTABLE FRAGRANCE LIST: http://perfumeoildirect.com/Printable-Fragrance-List_ep_41.html