I have had to use Garmin base camp. The other instructions as follows. Good luck
To transfer geocaches:
1 Sign in to your premium account on www.geocaching.com
2 Search for a geocache, and add it to a list
3 Add more geocaches to your list if desired
4 Go to your My Listspage
5 Connect the device to the computer
6 On your lists page, click to the right of the desired list, and choose Send to Garmin
7 The web browser may ask permission to open Garmin Express, allow it to do this
8 Express will confirm that you want to download this content from geocaching.com, selectDownload
9 If you have multiple compatible devices, Express will list all of them
10 Click next to the device you want to send to.
When the Installation complete message displays, the list of caches has been successfully installed and the device can be safely disconnected from the computer. Use BaseCamp to remove unwanted caches from your device.
A video on how to perform this action can also be found on a Geocaching.com blog.