How do you replace the motion drive belt on an older Murray riding mower, model 42590?

i am having difficulty replacing the motion drive belt,tricks, hints anything, routing directions. The old one snapped and I have no idea how to route the belt. Illustration does not appear accurateHow do you replace the motion drive belt on an older Murray riding mower, model 42590?http://lawnandgarden.manualsonline.com/e鈥?/a>