How do you replace the rear wiper arm of an Audi Q7?

I have an 2007 Audi Q7 3.6L, and its wiper arm is broken. I need to replace it, but I don't know how you take out the old arm.How do you replace the rear wiper arm of an Audi Q7?nope, can't be replaced. i can replace it but i can't, because i can't, but really you can't replace it because i can, i can't!How do you replace the rear wiper arm of an Audi Q7?youtube vidoe for that http://www.youtube.com/watch?v=dQw4w9WgXcQ