To rate a trip:

Open the trip in the itinerary view.

Select the appropriate number of stars in the header. Five is the best and one is the worst.
You can rate your trips to indicate how much you enjoyed them. Use these ratings to sort your trips in the Trip Library and revisit your favorites.
Open the trip in the itinerary view.
Select the appropriate number of stars in the header. Five is the best and one is the worst.