The sellers contact information isn't displayed on the ad (unless you create the actual field or the customer types it into the description). The contact form in the sidebar allows potential buyers to communicate the seller, but the actual contact information in terms of the email address is not given to the potential buyer unless the seller actually responds to their email. Anything outside of this would require customization on your part, however our themes are not encrypted, so you are free to make modifications if you wish. Thanks.