I've got a Bugaboo donkey and as it's getting chillier I'm trying to attach the footmuff to the pushchair, but not having much luck. Unlike other pushchairs I've had, the straps don't feed through the back and they don't clip on and off - they are completely stitched and I can't undo them. So how do I get the straps through the footmuff? The instruction booklet has a very vague drawing that doesn't actually show you how to detach the straps. I know the donkey is a pretty new model, but maybe it's the same set-up as the cameleon? Advice please, before I explode and my daughter freezes to death!