Using the MyoWare Cable Shield is easy. First, connect your three - electrode sensor cable to the 3.5mm jack on the shield. This way, you can use the MyoWare Muscle Sensor without having it directly on your body. To stack it with other MyoWare boards, just use standard 0.1' headers in the two rows of 3 - pin plated through - holes at each end of the board. When using the shield with the MyoWare Muscle Sensor, make sure your power source is properly connected. The sensor measures muscle activity and gives an output voltage based on that. As for maintenance, keep the shield in a dry place and avoid getting it wet. Also, be gentle when connecting and disconnecting cables to prevent any damage to the jack or the board. Refer to the provided documents like the schematic and the MyoWare Sensor and Shields Guide for more detailed information.