Mousex and Mousey are the coordinates where you want the mouse to click. X and Y. You can get the coordinates by looking at the lower left of Simba. Where your mouse currently is will be the X and Y coordinates.
Ranx and Rany are the randomization for the coordinates where it will click. Which means where it click on the coordinates will always be different by X and Y amount of pixels.
Button is either MOUSE_LEFT or MOUSE_RIGHT, depending on the type of click you wish to do.
Mouse(500, 600, 10, 10, MOUSE_RIGHT);