So I brought a couple of transformers off of ebay and asked the seller to send them registered post after he had already invoiced me. I should of asked him before he sent the invoice but I was busy doing something else and I didn't think it would matter given that it was sunday night and I emailed asking a 5:30 this morning. Anyway the seller doesn't know how to update the invoice and I haven't sold anything on ebay for years so I don't know how to either. Can someone help me out with how to do it