Hi there Ken and welcome
To do this, you install the program Garmin Express which you can get from my link below
Onto your computer.
Once installed, you open it and then connect your Garmin to the computer via the data cable it came with.
Then within the software you see the option to update, click this and it will then update your unit for you.
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.