User Activity

A buyer paid for an item via Paypal, before I could invoice to include postage that we had agreed on. The buyer agrees and want to pay it. How do I now invoice for postage part only?
I've receive a counter offer from the seller. Before I respond, can others BIN on the listing? It's a BIN and best offer .How long do I have to respond to the offer?
 how do i block someone from bidding and  buying from me?
Winner did not pay. How do I put in a negative feedback of 'did not pay'? I've open & closed case. When I click leave feedback, the screen only show 2 options...green dot for feedback or leave feedback later. Where's the red dot for negative feedback...
Has been 5 days since auction ended. Winner did not respond to my message nor paid.I don't want to open an unpaid case coz it takes too long to close it. By then the second highest bidder might have bought elsewhere.If I offer second chance now, will...