Ebay problem

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

Seller needs to try this....I have a store so may be different for your seller....

click AWAITING PAYMENT on the left
click on the buyers item that sold
click VIEW PURCHASE HISTORY
should be a drop down menu to the right that says SEND INFORMATION


hope that helps. It works for me (mostly) lol

Thanks, I've sent the seller this information hopefully it works

not sure, I have resent an invoice in the past, but it was ages ago and I can't remember how I did it, I do remember that it wasn't hard, there are generally more options for that sort of thing from the sales page in the My eBay area. rather than the overview of everything page.