The planning board can be found at Backoffice -> Dispatch: left frame.
(click to enlarge)
It is possible to drag a triangle to another day. Just drop it on the small arrow symbol directly in front of the day name. The delivery date (or pick-up date) date will be changed accordingly.
It is also possible to drag a triangle to another node. Just drop it on the small arrow symbol directly in front of the node's name. The delivery (or pick-up) will be assigned to the new node automatically.
Please note that the pick-up triangle can be dragged independently from the delivery triangle and inadvertently be assigned to a different node. However, this might be exactly what the planner wants, for instance in cases where trailers are switched to other drivers.