The upper left pane contains the active task, and the lower one the list of all turnpoints. The upper right pane shows the Estimated Time of Arrival (ETA) at the final destination, and the Altitude Above the Ground level (AGL) upon arrival at different Mc Settings. 

     To edit a task, the pilot selects the row in the upper pane that should be modified, and then touches the turnpoint in the lower pane that should go into that row.

Pictured here is the editing of the first turnpoint of the task, which currently is set to MINDEN.

For a complete description see the User's Guide.