The seller contact details and seller contact information is located towards the bottom of the full-page ad. Be sure you are opening the full-page ad and not just looking at the search results list. There should be a "View Ad" button in the left column of the search results list. There is also link on the ad to a full-page of information about the seller. This page contains a description of the seller and a link to a zip code map of the seller's general location.