Just a wild guess based solely on looking at a photo that I found of one.
I suspect the slide is held on by the barrel, which is held on by lugs along the bottom rear of the barrel engaging in mating lugs in the receiver (similar to a Browning or FN 1910).
Try this (only don’t use too much force in case I’m wrong):
Pull the slide back until the safety engages the notch in the forward part of the slide.
Engage the notch, which should hold the slide to the rear.
Twist the barrel a bit over 45 degrees, probably clockwise looking from the rear of the pistol. This will disengage the lugs.
Pull the slide back slightly and disengage the safety.
With luck, the barrel and slide will move forward and off the receiver.
If my guess is correct, the barrel near the muzzle will probably have serrations or divits around it to grasp when you twist it.
I could easily be wrong - don't break the thing!