Siemens Lotus 13p Trimmer

I received one Siemens Lotus 13P hearing aid as a gift. I tried and hear better but seems that I may need some adjustments using trimmer controls. But the manual is in Chiense. (1) How to open its trimmer box to adjust controls? (2) How can I get an English manual?. I would really appreciate help. Thanks.:mad:

The Lotus seems to be a model sold primarily in Asia. If you go to

then click on “Contact,” you can fill out a form and request an English instruction manual.