To use this Blackmagic Design MultiView 4 HD device, you'll need to connect it to an external power supply as it doesn't have one included. First, find a suitable power source with the right voltage for the device. Then connect the device to your HD setup. When using, make sure the connections are stable to avoid signal issues. For maintenance, keep the device in a clean and dry place. Regularly check the cables for any signs of wear and tear. Don't expose it to extreme temperatures or humidity as this can damage the device.