WiFi + Bluetooth

I'd suggest the 'as-is' method.

Basically, plug the shield onto the Pixl.js, but then you need to add an additional 3 wires, which you can do on the shield itself:

• Connect a jumper lead from the TXD pin on Debug Port to D0 on the Arduino header
  
• Connect a jumper lead from the RXD pin on Debug Port to D1 on the Arduino header
  
• Connect Vin to GND
  
  

The third one is something you can do with a solder-jumper on Pixl.js itself, but in the interests of not getting a soldering iron out you can do it just with wire.

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