You don’t have to type in any values, you can select the spot on the screen.
The widget combination bascially defines a start point and an ending point, and then moves the mouse cursor from start to end with mouse button pressed.
The write error looks like maybe you’re running the game from an external sd card. In that case, you’ll have to request r/w access via Global Settings -> Request permissions. That’s a stupid Google restriction that can only be circumvented manually.