In order to clear the MyKey key, you need an "admin key" that doesn't have MyKey set up. Turn on the ignition with the admin key, press the Setup button for the I go screen until you get to something like "Clear MyKey" or "MyKey Settings". When you get to that, press Reset (you may have to hold it). If you don't have any admin keys, like if both keys were setup as a MyKey, I'm pretty sure you have to go to a dealer. This the only part I'm uncertain about.