I have bought somthing from Ebay. When I went to pay for it via Paypal it said near the persons email address that this email address is unregistered so i cancelled the payment and have messaged the seller with no response.. what should I do now?
All you can do is sit back and wait for the seller to respond. Are they fairly new? If so, they might not know that they have to upgrade thier paypal account to accept payments.
