Grab the Adafruit Motor Shield V2 and the Adafruit Bluefruit LE SPI Friend module. We need to stacks the module on top of motor shield. To do that, we need to solder the included headers to the pins on the Adafruit Bluefruit LE SPI Friend.
OK, now that we have some wires to work with, let's start by soldering the voltage and ground pins. Locate the VIN and GND pins on the Arduino. We need to connect a wire from those to the VIN and GND pins on the Bluefruit LE SPI friend.
Start soldering by wiring to the ground and voltage in pins to the pins on the motor shield. Tin the header pins on the Bluefruit LE SPI friend and solder the wire from the motor shield to the header pin. Repeat this process for the 8 connections.
Use the diagram above to reference the wiring connections. Because we're working underneath the PCB's, it's hard to guage which pin is what. The diagram includes labales and colored lines to represent connections.
The wiring may require a bit of finesse. I'm left handed and found myself in some tight spots where I had to solder the wires in a certain order. Ensure there isn't any cold solder joints and that the wires are properly soldered to the header pins.
The final wiring looks like a knot, I know - wish they were as clean as the diagram! Anyway, I used 26AWG silicone-coated wires cause it's less likely for these wires to break with the given stress-relief.
Next up grab some headers left over from the SPI friend and cut them down to size so they fit the pins on the Arduino Uno.
A very talented Dragon once said, "the solder joints should look like Hershey's Kisses™."