If you have already plotted your journey, but then realise that you missed a stop, or want to add a new stop between stops, follow these steps;
The map should automatically change the route. In some cases, if it isn’t sure of the mode of transport you want along the new route, it might draw a straight line. If this happens, right click on the straight route line, select ‘Edit travel via’, and re-select the correct mode of transport.
If you have created an itinerary of places that are not connected by a route, you can simply drag and drop the stops from the white right hand panel.