Hi Baz, it’s supposed to be intuitive! Some chance. I can’t find instructions either, there are some tutorials on You-Tube, most in Chinese and one in English but the guy is mumbling behind a track of “The Girl with the flaxen hair” i.e. a complete waste of time.
I have it on my phone and also on my MacBook there seem to be some differences, to be fair it does say that it’s only really for tablet/phone devices.