I also can't find instructions - i think the wiring scheme its like this
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... with the new Firmware (Marlin 1.0 RC) the Heatbed is working.
I was about to ask for which two pins are for the heater/thermistor, but that confirm me (I assumed it was like for the extruder-heater ntc/ntc/heat/heat from right to left).
Yet I cant' read a bed temp in Pronterface, in marlin 0.9.10B unofficial I saw that it miss a #define thermistorbed, but still not work... I'll try with the 1.0 RC, hope it'll work
it should work with 0.9.10b and 1.0RC - check your thermistor is working - disconnect it form the board and measure the resistance (~100k at roomtemp)
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this is the wiring of my C3dP\wD - orca
blue - thermistor
brown - Heatbed