Problem to caribrate new smart trainer "powerplus"

I bought a new smart trainer “PowerPlus” , brand from China, having connected successful and currently tried to caribrate on Zwift app in my laptop but no wrench icon. Is there any suggestion to fix the problem? My laptop installed WINDOWS 7.

Does PowerPlus have their own app or calibration tool? Using that would be recommended.

Are you connecting via bluetooth? Use Ant+ if possible, that might get you the calibration icon.

It would be good if the company provides software for caribrating but now no app for powerplus at all. I paired zwift via ant+ . The page shown below.

Does the company provide details about calibration?

Some brands say there trainers don’t need calibration. If it doesn’t show up on Bluetooth either than I’d suggest either contacting the manufacturer or assuming it is accurate for life.