First thing to know is that all of these fields are optional. The year field allows you to set a range of model years. To look at just one model year, enter the year in both boxes. Make lets you type the manufacturer name in. Price range is self explanatory, prices are in U.S. Dollars. Keyword is a helpful feature and many find they use it exclusively. Type in a manufacturer name or special feature and the search will look for all ads that include those words.