Keeping in mind these steps one by one:
Turn on the compressor.
Let the tank fill with air.
Make sure that the tank is full.
Then Check the PSI and make sure your air tools are compatible with the compressor too.
Connect your tool and hose with the air compressor.
Adjust the pressure regulator accurately.
In the end, locate your knob.
And then turn this knob clockwise and raise the pressure.
And the pressure regulator is adjusted.