well the x and the y are the location of the destination, say the table is at (4, 10) you'd enter those numbers.
example:
Put this in a script command in an event, like where you would put the move route.
x = 4
y = 10
id = <id of event to move>
$path = A_Star_Pathfinder.new
$path.setup(Node.new(x, y), id, 1)
$path.character.stop_all_paths
$path.calculate_path
$path.generate_path
if you wanna know what the X and Y are:
Map Id: Name (size) (X, Y)
when you select a location in event layer, it will show at the bottom of the window.