I just bought an HRM-Dual heart monitor. I opened Garmin connect app on my iPhone and selected add a device. The Garmin menu showed "select a device" and I went through them all and found the HRM-Pro but no other heart monitor. I tried the HRM-Pro but it would not connect to my HRM-Dual. I selected "Don't see your device" and it stated to go to garminconnect.com/ and add the device on my Garmin Connect account. I did that and could not find a way to connect it. Help!