I've just unpacked my new Da Vinci Nano printer and hooked it up to my laptop. Next stage is to apply the tape to the base plate. I'm following the first time printing tutorial and have pulled the two black clips free of the glass. In the video, the glass pops up and can be pulled free. Mine is absolutely stuck to the metal tray and won't budge. It must be something simple, but I can't understand what at the moment!

Any help gratefully received!
Kind regards,
Ian