Using the Marshall PS - 102 - HDI is easy. First, connect it to a power source using the provided power supply. Then, connect it to your device via HDMI. Log in with the default username 'admin' and password '12345'. When using, make sure the connections are stable. Avoid exposing it to extreme temperatures or humidity. To maintain it, keep it clean and dust - free. You can use a soft, dry cloth to wipe it regularly. If there are any issues, don't try to repair it yourself but contact the manufacturer's support team.