Ok my bad, For some reason I thought your post said just the front seat, after you remove the front seat, you can see how the rear pillion is mounted to remove it.
I haven't tried it on my 950 yet but they ususally bolt on with one bolt.
I'll have to take a look at mine and I will get back to you.
sorry, I think I need to use my glasses more often!
Edit: once you remove the front seat you will see two small bolts that hold the seat down on the front, that is a bracket that mounts to your fender.
In order to take off the passenger seat, remove the rider seat. Then, under the passenger seat there are two bolts going towards the back of the bike. remove them, then slide the seat forward. Hope that helps