Filmshooting

I hope i'm posting in the right thread...
I have my fathers Zeiss Ikon M811. It looks in wonderful condition.
I cant seem to understand how to open up the film area. Can anyone help, or is there a on line manual?
I don't want to damabe camera trying to figure it out..
PS. I believed I posted this ...

I have been passed down this wonderful camera, problem is no manual.
everything about it looks very clean, how do I open the film area ?
Or is there an online manual.