Well first I would define your mouse correctly what I would do (there are several ways to do it) is this define the mouse key map at the top

#define mouseRight 281

and replace if(mouse_right) with
if(key_pressed(mouseRight))
//This assumes your using lite-C

Increase your sensitivity of the mouse by like 5 or 10 or so (just add * 5 ect. after mouse_force.x ect.) so you can actually see it move.

It looks like you took his code, then massacred it, instead of just taking out the automatic movement and replacing it with mouse_force movement. I'll edit with what I'm talking about below.