Making transparent layers with Google Earth layer

I am guessing the GPS gpx file gets added as a point layer.

1. Make sure Layers panel is on. View | Panels | Check box for panels
2. If just your Google layer and GPS layer are added, you should see the Google layer above and GPS layer below. Click on the GPS layer, hold, drag and drop above the Google layer.

You should be able to see the GPS points on Google layer.

You need to first convert your gpx file to a kml or kmz.

I prefer GPSBabel to do this, but over there years several other software packages that will do the same thing have been published.

This Article on Importing GPS Tracks into Google Earth gives you a couple more plus an overview on the whole process.