Touch enter bar or the triangle to edit your start point by one of the following methods: entering an address, using My Location, selecting a start point on a map, selecting a starred item, selecting an address from your contacts or using search history.
Do likewise for your end point.
To reverse directions, touch Menu icon 
and touch Reverse Start& End.
Then select a transport mode: driving by car, using public transportation, or walking directions.
Finally touch GET DIRECTIONS.
A couple of suggested routes will appear in a list. Touch any routes to
view their respective detailed directions.
To get reverse directions for a route you’ve already made, simply open
that route’s directions window and touch Menu icon 
and Reverse. No need to enter your start point and end point again.
9.4.2Preview suggested routes and decide on a route
more preferable or feasible to you
You can preview each turn in your route in Navigation, Satellite, and other views.
Touch a left or right arrow to preview the next or previous leg of your route.
You can view
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