Which device or browser are you using? Some things are just not possible on the app or mobile browser, so if using those, switch to a laptop / PC and use Chrome, try from there.
If there is still some difficulty, contact eBay Customer Services to 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 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@cjmounthill