if you register with ford etis, you can access the manual online for about €15 per day
its would be worth getting a haynes manual for a car with a similar engine, say fiesta, which bmax shares many components.
there are various online resources showing how the serpentine belt / stretchy belt can be replaced, including some videos.
for example
[ame]https://www.youtube.com/watch?v=hr0qYJb3I9o[/ame]