Log on to the site and either go to your profile or to the house in question. You will see an "Edit" link that will take you to a form where you can make the changes you want. Links to edit questions and images can be found in the same place, but you will always be taken to the questions form when you save or update a property.

Before you publish your property you can make as many changes to the page as you want. The property will only be displayed on the site once published.

Any changes you make to the property after it has been published will be updated when you click the 'save' button.