OK, things are clearer now, but I don't have much of a better answer, but maybe try this. Open the sunroof in tilt mode, in other words so that the rear edge tilts up. This will give you some room to play with the fabric liner. I'm not sure about this, but try gently pushing the liner up and then back, maybe that'll get you the access that you need. Beyond that, I'm out of suggestions, other than to say see if you can stop by an autobody shop, you might find a kind soul who'll tell you how to do it, or do it for you, for no money, stuff like this is probably quite common to them.