1. Connect your Garmin device to the computer with the appropriate USB data cable.
2. Open Garmin Express™ software
For instructions on installing Garmin Express, see this FAQ.
3. Right-click the device you want to change the registration email for
4. Click Remove From Express
5. Click Remove
6. Click Add Device
7. When the device is found, click Add Device
8. In the box on this screen, enter the email address which you would like your device to be registered under
9. Click Next
10. Enter a nickname for this device, if desired
11. Click Next
12. Click Yes or No to agree or disagree with anonymous data collection, if prompted.
The device will now be registered to the email address entered in step 8 above.