Take a moment to review the components in the circuit diagram. This illustration is meant for referencing wired connections - The length of wire, position and size of components are not exact.
The 500mAh lithium polymer battery is connected to the microUSB lipo charger via JST cable. The Bluefruit EZ-Key has VIN pin connected to a slide switch. The BAT pin on the micro lipo charger is wired to the slide switch. The ground pin on the Bluefruit EZ-Key is wired to the GND pin on the micro lipo charger.
A 6mm tactile switch is wired to pins 3V and PB on the Bluefruit EZ-Key to serve as a bluetooth pair button.
The 6mm and 12mm tactile button inputs are wired to input pins 0-7 on the Bluefruit EZ-Key. Each tactile button has ground connected to ground rails on the Perma-Proto PCB.
The 1/2 sized Perma-proto breadboard PCB will house the 8 momentary push buttons. The right-side of each buttons will act as the ground connection. Each of the buttons right terminal are wired to the ground rail. The two ground rails are wired together. A single wire for the ground connection is wired to the Bluefruit EZ-Key. Each botton left terminal has a wired connection to the input pins.
The input connections on the Perma-Proto should preferably be made on the back of the PCB and close-to to terminal, not actually on the same through-hole.
Be very aware and cautious when wiring these connections. It's easy to get lost and loose your place/spot while soldering. Always double check your connections before you solder!