This dialog appears when you click Edit > Parameter Order. It helps you to adjust the order of parameters. See the dialog.
The following are details about options in the dialog:
Parameters
Lists all the parameters used in the report set.
Move up
Moves the selected parameter up by one step.
Move down
Moves the selected parameter down by one step.
OK
Applies all changes and closes the dialog.
Cancel
Closes the dialog, leaving any changes unsaved.