To learn more about the optimal route that you have just computed, click on the "Grib Manager" button, circled at the top in the image below.
To learn about an individual Grib forecast, click on its entry. Below, we have clicked on "Wind", and are viewing information about the wind forecast, along with various options for displaying it.
By clicking on the little lightbulbs, you can choose whether a weather forecast sequence is displayed on the chart.