[jee7s]

There's no specific port for it, just don't use AI8 on module 1, since that's for battery voltage.

The easiest test is to turn it vertical and note the change in reading. If you lay the board flat, you should get the steady state center reading. By standing it up, you are putting one of the two axes in line with acceleration due to gravity. Measuring in this position should give a reading of the steady state plus or minus (depending on the orientation) the V/g sensitivity of the accelerometer.