Using the MyoWare Proto Shield is easy. First, attach it to your MyoWare Muscle Sensor. Then, if you have custom circuitry, use the provided area with 8 x 15 solderable through - holes on the 0.1' grid to solder your components. You can stack it with other MyoWare boards by using standard 0.1' headers in the two rows of 3 - pin plated through - holes at each end of the board. When using the attached MyoWare Muscle Sensor, keep in mind that it measures muscle electrical activity. The output voltage depends on how active the muscle is. For maintenance, keep the shield clean and dry. Avoid exposing it to extreme temperatures or moisture. If you face any issues, refer to the included documents like the Schematic, Eagle Files, and MyoWare Sensor & Shields Guide. You can also check the GitHub page for additional support and resources.