Once you select "Take This Trip!" on any GenieTrip, you may then go into "Routing Options" and select "Reverse Trip." This will reverse the whole trip including other stops you have entered. It may be easier to not add additional starting and ending stops until you have reversed the GenieTrip in the Trip Planner. Alternatively, you could enter your start/end points and other desired stops in reverse order if you plan to reverse the GenieTrip. Then, when the Trip Planner provides your route, press the "Reverse Trip" button under "Route Options."