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The first thing to do is simply download, install, and use Garmin Express.
and (if you have a Windows PC) click on the big blue Download button at center bottom of the page.
(If you have an Apple, click on the nearby Download for Mac link.)
And download Garmin Express' installer to your computer, save it, then double-click upon it to install Garmin Express.Then start the program, Garmin Express. Then connect your Garmin device. Then after a pause of about two minutes or so, to let it be recognized by the computer (essential the first time you do this, at least), use Garmin Express to update your device.
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