On the Moteino shields page there is a photo and some sample code to read the SD card.
The photo shows silkscreen with the required pins that need to be connected:
- SPI pins (MI, MO, SCK, CS)
- power (3V, GND)
- EN (power enable) - this needs to go LOW as in the sample code to provide power to the SD card
- CD (card detect) - this one has an OPEN solder jumper, this pin is not commonly used
The code comments also illustrate the connections.
I just fixed the sample code missing includes so that should compile without issue.
I would suggest soldering pins to an SD card breakout and try it on a breadboard or with a Moteino, like this (notice only some the required pins are actually soldered):
