Do you mean on the listing where you marked it as dispatched? You should be able to edit it to the correct numbers, but use a laptop / PC and try Chrome, and don't use the app or mobile browser.
If you find you cannot manually change the numbers, contact eBay Customer Service they will do this for you.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open between 8 a.m. to 10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends.
I recommend contacting CS very first thing in the morning, when the lines first open, as there's more chance of Dublin answering.
@graham247247
