Newbie Question Regarding Sparkfun Pro Ethernet and I-Snail-VC-10

It would appear that you connect the - side of the i-Snail-VC to Ground and the + side to one of the analog input pins.

float volts = analogRead(iSnailPin) * 5.0/1024.0;
float ampsRMS = volts / 100.0;  // Measured current in amps.