When you import the GPX data, assuming it is in the correct format - the program will generate a route map as shown below - once this is done you can edit the track style, animation, waypoints etc in the same way as if you manually create a route.
The manual is available under Help at the bottom of the map selection screen.
Note - if you have a NMEA format GPS/track file this will require converting to GPX format - there are plenty of online converters that can do this.