heated bed thermistor pin number required for MPX.3 3d board

i cant seem to get my temp of my bed using the MPX.3 
https://www.amazon.com/HICTOP-Printer-Control-RepRap-Arduino-compatible/dp/B015W7PWRG ;
I have tried the default and just get rturned 33 degrees no matter what thermistor i select i have trie new thermistors and cable and no diferance .
can anyoine please tell me the pin i need for the fiormware 
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