Hi you have to first set the overlay to the scene like this
BACKGROUNDNAME with OVERLAYNAME at layer 2
@CHARACTER spot… AND CHARACTER moves to layer 1
after that if your overlay will not be at the spot you will have to move it there.
in the preview open the spotdirecting helper and click on the change overlay - you shoud see the name of the overlay there - once its active move it on screen (like when you move the character) till it is where you need it.
and then copy the coordinates to your script.