GX680 film holder removal

Can anyone forum member tell me how I remove the film holder from a GX680 model 1. I have a manual but it is very unclear how to do the removal. Any help gratefully received.

Removal of the complete 120/220 magazine:
Press the grey button on the camera's back and rotate the magazine counterclockwise until you can remove it from its bayonet. The darkslide has to be in place!
Removal of the film cassette: Open the back door of the magazine by pushing the grey lever down. Grab the cassette at its two grey levers, push them towards each other and pull the cassette out.

The Polaroid back can be removed by releasing two levers above and beneath the door (no rotation required in this case). The removal is not interlocked with the presence of the darkslide, don't waste your film.

Thank you Lightproof - back now off!