To remove the panel, you'll first have to open it partly, about 6 inches or more to get a bit of working space. Since the car won't have power, you'll have to remove the pannel where the roof lights are. There you will see a wheel into which you have to insert a key to make it turn. It's a hex type, shaped like an S more or less, and is usually found in the tools compartment.
Then you must pull on the inside pannel of the sunroof, which is held into place by two plastic clips on each side. They pinch onto the roof, so you just have to open them up. If you open the roof far enough, you could have a look with your seeing eyes. Once that pannel is free, push it all the way back, and close the roof, and have it lift up the rear part so you can work and see.
You'll then see 6 screws to undo, 3 per side, holding the pannel in place. Two per side must be undone where one can stay in place but loosed. The screws are torx type.
No pics on hand, sorry.