Found it
In case this helps someone
1. Press Processing button on mixer
2. Tap “ST. INPUTS/FX”
3. Tap your FX you want to send to Aux (FX1, FX2, FX3 or Fx4 on right middle of screen)
4. Tap SENDS at bottom of that particular Fx#
5. Turn it up in whatever Aux Out you want it processing.
One other important note. This has a 1 to 1 relationship with the “SENDS TO” level for each input you are monitoring. If that’s not sending anything to the main you don’t get anything in your ear (I might be wrong here though pre/post?)