Select from your hard-disk the '.igc' file you want to convert :
Time zone :

Option 1 - Path color :
White   - Blue   - Green   - Yellow   - Orange   - Red   - Black
Option 2 - Render type :
Simple line (example)   - Extruded (example)  
Option 3 - Waypoints :
Display a waypoint every minutes. (example)

the same, but in french...

If you're looking for the most complete igc->kml converter on earth, have a look here.
It has more than you can need (except for a form in english).