HELP:Like in theory/can’t make some effects work – Fine - Photo Editor Review

This app is exactly what I want (in theory) & price is right. However I can’t find how to actually apply bokeh, just one example. I get the sliders for strength but I’ve clicked the effect before & after sliding, neither works. ?I clicked help but was direct to a web site, can’t read language. Can ANYONE HELP, either user or developer??? I’d happily rate 5 if app delivered as promised & will revise review if so.
Review by Eplr on Fine - Photo Editor.