There are 5 addresses you need to crrext and add your necessary correct address details, add them here:
https://accountsettings:ebay.co.uk/uas/addresses.
have you purchased something and the seller has the incorrect address? Then, message the seller inform them of this, they may wish to cancel the order, refund you , so you can add your correct address to your account, and relist the item for you to buy this again.
Before paying at eBay checkout, take a quick look at the delivery address on the left hand side. That is the address shown to the seller to post your item to. If it is incorrect , you can change those details there.