In "Add Features" you can not only add icons, textboxes, markes etc., but you can also draw lines, polygons and routes.
Simply start by clicking on the map. The line/polygon will follow your clicks. Once you click on "Done", you have further options to manipulate the stroke and colour (also of the filling of the polygon).
With the routing option it is possible to automatically create a route based on HERE navigation data for vehicles. The suggested line can be changed by dragging the points which are sitting on the blue leadline. In the exported map the blue line is not visible anymore. Click on "Done" to change the colour and the stroke.