Hi there and welcome Mike
To do the update, you install Garmin Express on your computer from my link below
Once installed, open it and connect your Garmin to the computer and via the computer you can then update the device.
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.