To show contact details on your For-Sale landing pages you to make sure you have successfully set-up your Profile first. The information in your profile will be displayed on your For-Sale landing pages and/or your marketplace. To complete your profile you navigate to Account > Profile.
Your Email address, Website address, Skype, Facebook and the Twitter handle will be included on your For-Sale landing pages and marketplace. Your Phone number will only be shown on your marketplace and not on any of your individual For-Sale landing pages. If you prefer not to publish your contact details at all you can change this on the Settings > Marketplace page by unchecking the “show contact details” checkbox.