Type in the address (in the Location bar at the top of the Zillow web site) of the property that you want a Zestimate of and click on the search magnify icon. When the property details come up, double click on the address and you will see a figure next to Zestimate. That is the estimated value according to Zillow figures. If you need a more detailed estimated value of a property, contact a Realtor and they can run a report based on comparable properties that have recently sold in a given neighborhood.
Type in your address and click go. When you see your property come up, double click on the address and look for the number next to Zestimate. That is the estimated value of your property according to Zillow figures. To double check that figure, contact a Realtor and they can run comps and get a value based on comparable home sales in your home's immediate neighborhood.