Hi I was having trouble making contact with the seller. So I used feedback as per trade me advise. But as it was a request for contact I left it as a neutral feedback. But now that the trade has been completed I’d like to change it to a positive one with positive feedback. When I went in to edit it would not let me. Is there anyway I can change this?

Hi I’ve won an auction. But I haven’t received any contact from the seller. And when I try to email them. There email comes back as invalid. I really want to complete this trade. And am happy to pay. What can I do? And how please?