Garmin Registration involves very few steps. Connect your Garmin GPS to your computer using any USB cable that supports it, then open Garmin Express on your computer. As you've previously connected your GPS to your computer, you'll see an option to "add a device. Click on that option to begin Garmin product registration. After that, type in your Garmin email address and click "Next.". Input your device's "Nickname" as well. Accept the terms & conditions at this time. And that's it.