Hi Yerigh,
I’m not sure since I don’t have this movement with me but I think the lever you need to push on may be hiding along the edge of the movement next to the stem. Try clicking the stem in and out into the set position and you should see a small lever with a little indentation moving back and forth. When (if) you see it push the stem back in and then push the indentation with a pin and pull the stem out.
Hope that’s does it Yerigh,
Enjoy,
Bob