I have a Wirgin Edinex that looks similar but it has a rigid, not collapsible, lens.
Mine has a slot in the takeup spool.
You need to turn the film counter knob counter clockwise to 0 before starting the film.
Dial 2 "V/R" is the advance/rewind switch, and dial 1 releases the advance after each exposure. You set dial 2 to V to advance. Wind one exposure, then the toothed sprocket stops. Take the exposure, then push dial 1 to the right, in the direction of the arrow. This releases the wind stop and allows you to wind to the next exposure. At the end of the roll, set dial 2 to "R" and that frees the toothed wheel to go backwards, allowing rewinding as in most 35mm cameras.
At least on mine, the wind knob and toothed wheel seem to be both connected to the wind stop somehow. So that if I flick dial 1, the wind release, to the right, and turn only the toothed wheel without tensioning the wind knob (with the back open and no film of course), it doesn't advance the correct number of sprockets. I am not sure if it's a little out of adjustment, or if you're actually supposed to start turning the wind knob before letting go of dial 1.