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 refers to the manufacturer. Price range is self explanatory, prices are in U.S. Dollars only. Keyword is a helpful feature than many use exclusively on the site. Type in a manufacturer name or special feature and the search will look for all ads that include those words.