To be able to use ColdFusion on a website you'll need to find a hosting company that does ColdFusion hosting.  There are many factors in deciding on a web host, such as the control panel available for use on your ColdFusion web hosting as well as what kinds of ColdFusion support the host provides through the phone and e-mail.  Intermedia.net has multiple control panel options and 24/7 support for their ColdFusion hosting services, so compare others to them and you might find yourself coming back to them in the end anyway!