If the seller will not respond to provide payment information after accepting your offer, you should post a Poor rating to the sellers account warning others of your experience with them. However, two days is not a very long time. Any of a number of things could be going on preventing the seller from getting back to you. My suggestion is to give him a week. If he doesn't get back to you by that time, then I would consider posting a rating to his account, send him an email stating the transaction is off and move on to another seller.