Has anyone figured out how to change the security key from the iphone to the fob? They just sent me the physical security key, and I'd like to use that, but I can't figure out how to switch. I would need to get back to the initial security page that has you enter the serial number on the fob, but clicking on the security key link doesn't work. I tried emailing customer service, but they just sent me a link to the security key link page....