There are only two parameters that sets homing with index:
-Use index pulse for homing: disabled, positive edge or negative edge
-Index search direction: positive or negative
So first define wich polarity pulse the encoder is outputting. In 99% cases its positive. Then just choose rotating direction where drive starts looking for index. If you choose positive, then drive will rotate motor to positive direction and stops at index pulse.
You might also want to use index with home switch or hard stop homing feature to make drive stop on correct revolution. You may also adjust homing speed from Trajectory planner page.
Its safe to experiment with settings if you set torque limits so low that hitting machine ends won't damage anything.