I just pushed them towards the door (or was it the other way?) with my fingers and lifted them up on the opposite side.
Can't remember the direction. If you look at the new ones you will see, that one side has a kind of a flexible clip the other side is solid.
You have to push towards the clipside then you should be able to lift up the other side and they come off.
If you put them back in. just do it the other way around. They snap in.
Akki