I just download all of my flight logs from the SD card to my computer. You can find them under \User\#FlightTrails on the SD card. Put them wherever you like.
Then in Google Earth choose File, Open... then in the Open Dialog choose file type: All Files (*.*)
If I fly multiple flights on one day I often stitch them together using NotePad++ and rename the result. Just be sure to get them in time order, that seems to matter to Google Earth.