Did you get the Honda one? It has a rectangler digital push button controller with 4 heat settings. If so, it mounts on the left flairing top just below the lid to the left pocket. It will come with a mounting template that helps you position it and make the hole for it. Mine was installed by the dealer as part of my purchase, but I do have the instructions. Wait for yours to come and there should be instructions with it. Hope that helps.
Arrgh, Mellow beat me to it. I'm too slow at posting! Well, I tried to help, but he knows just about where to find anything on this site. I think we should all just email him with our questions. (LOL)