How do you fix a soft brake on Mangosteen motorcycle?

How do you fix a soft brake on Mangosteen motorcycle?
The most common reason for a soft brake pedal is simply air still in the system. The easiest way to diagnose this problem is to pump the brake pedal gently a few times.
Squeeze the brake lever (front), then loosen the bleeder valve. Once the lever compresses all the way in to the grip, close the bleed valve, then release the lever. Repeat this process as necessary to work fluid/air out of the system.
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How do you change the brake fluid?