Using this AJA Ki Pro Rack video recorder and player is quite straightforward. First, make sure you've connected it to the correct power supply that comes with it. When you want to record or play videos, just use the corresponding buttons on the device. For audio, you can plug in your headphones. But remember, the headphone volume knob might stick, so turn it gently. As for maintenance, keep the device in a clean and dry place. Avoid exposing it to extreme temperatures or humidity. Regularly check the power supply for any signs of damage to ensure smooth operation.