Change of Delivery Method

[hiraeth1234]

Buyer clicked the collection from seller option. He paid me. He then decided he’d like me to post it. I’m happy to but how do I change  it so he can pay me the postage. 

[plum993]

Keep the buyer informed, and look to cancel the sale using the buyer requests to cancel so you get no ebay comeback, then relist the item adding the postage option and cost.