No option to reverse direction of pre-loaded routes in Route Planner (66i)

 I have some routes loaded onto my 66i that I want to reverse, the user guides say to go to "Route Planner", then select the route, the select "Reverse Route", but my device does not display any option for reversing. I can only select, view map, elevation plot, change name, or delete route. I need to be able to reverse directions of the various routes while I am on my trip, I dont want to have to set it up through Base Camp and be locked into directions. Anyone know why I don`t have this option?