The position of the object is two variables (x, y)
You can access them, as with any other variable (objectName.variable)
So these two will be, as Paul said:
object.x object.y
To make the object move to a point, you can better use this built-in function:
move_towards_point(object.x,object.y,speed)
It will move at the speed pixels every time it is executed, so you can put it in the Step event.
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